diff --git a/CHANGELOG.md b/CHANGELOG.md
index 397119ea..005f119a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### v1.7.1
 
 -   Types fix for `@unified-latex/unified-latex-types`
+-   Fixed AST when expanding `\sysdelim` macros for rendering `\systeme{}` macros with KaTeX
 
 ### v1.7.0
 
diff --git a/packages/unified-latex-prettier/libs/printer/printer.ts b/packages/unified-latex-prettier/libs/printer/printer.ts
index 95ca2ddd..25eeb45e 100644
--- a/packages/unified-latex-prettier/libs/printer/printer.ts
+++ b/packages/unified-latex-prettier/libs/printer/printer.ts
@@ -84,7 +84,20 @@ export function printLatexAst(
         case "whitespace":
             return line;
         default:
-            console.warn("Printing unknown type", node);
+            console.warn(`Printing unknown type ${readableType(node)}`, node);
             return printRaw(node);
     }
 }
+
+/**
+ * Get a printable type for an object.
+ */
+function readableType(obj: any): string {
+    if (obj == null) {
+        return "null";
+    }
+    if (Array.isArray(obj)) {
+        return "array";
+    }
+    return typeof obj;
+}
diff --git a/packages/unified-latex-to-hast/libs/pre-html-subs/katex-subs.ts b/packages/unified-latex-to-hast/libs/pre-html-subs/katex-subs.ts
index 2c673e35..67e1d91f 100644
--- a/packages/unified-latex-to-hast/libs/pre-html-subs/katex-subs.ts
+++ b/packages/unified-latex-to-hast/libs/pre-html-subs/katex-subs.ts
@@ -28,11 +28,17 @@ export const katexSpecificMacroReplacements: Record<
             });
 
             // If we have information about the sysdelims, then apply them
-            if (node._renderInfo?.sysdelims) {
-                const [frontDelim, backDelim]: [Ast.Node, Ast.Node] = node
+            if (node?._renderInfo?.sysdelims) {
+                const [frontDelim, backDelim]: [Ast.Node[], Ast.Node[]] = node
                     ._renderInfo?.sysdelims as any;
 
-                return [LEFT, frontDelim, ret, RIGHT, backDelim];
+                return [
+                    LEFT,
+                    ...(frontDelim || []),
+                    ret,
+                    RIGHT,
+                    ...(backDelim || []),
+                ];
             }
 
             return [LEFT, DEFAULT_LEFT_DELIM, ret, RIGHT, DEFAULT_RIGHT_DELIM];
diff --git a/packages/unified-latex-to-hast/tests/katex-subs.test.ts b/packages/unified-latex-to-hast/tests/katex-subs.test.ts
new file mode 100644
index 00000000..f02529c8
--- /dev/null
+++ b/packages/unified-latex-to-hast/tests/katex-subs.test.ts
@@ -0,0 +1,132 @@
+import { describe, it, expect } from "vitest";
+import util from "util";
+import { parse } from "@unified-latex/unified-latex-util-parse";
+import { replaceNode } from "@unified-latex/unified-latex-util-replace";
+import {
+    attachNeededRenderInfo,
+    katexSpecificMacroReplacements,
+} from "../libs/pre-html-subs/katex-subs";
+import { match } from "@unified-latex/unified-latex-util-match";
+import { Macro, Node } from "@unified-latex/unified-latex-types/index";
+import { trimRenderInfo } from "@unified-latex/unified-latex-util-render-info";
+
+// Make console.log pretty-print by default
+const origLog = console.log;
+console.log = (...args) => {
+    origLog(...args.map((x) => util.inspect(x, false, 10, true)));
+};
+
+describe("unified-latex-to-hast:katex-subs", () => {
+    it("can expand systeme", () => {
+        const parsed = trimRenderInfo(
+            parse("$\\sysdelim{[}{.}x=\\systeme{a&b\\\\x&y}$")
+        );
+        const isKatexMacro = match.createMacroMatcher(
+            katexSpecificMacroReplacements
+        );
+        attachNeededRenderInfo(parsed);
+        replaceNode(parsed, (node: Macro) => {
+            if (isKatexMacro(node)) {
+                return katexSpecificMacroReplacements[node.content](node);
+            }
+        });
+
+        //trimRenderInfo(parsed);
+
+        expect(parsed).toEqual({
+            content: [
+                {
+                    content: [
+                        {
+                            content: "x",
+                            type: "string",
+                        },
+                        {
+                            content: "=",
+                            type: "string",
+                        },
+                        {
+                            content: "left",
+                            type: "macro",
+                        },
+                        {
+                            content: "[",
+                            type: "string",
+                        },
+                        {
+                            args: [
+                                {
+                                    closeMark: "}",
+                                    content: [
+                                        {
+                                            content: "r",
+                                            type: "string",
+                                        },
+                                    ],
+                                    openMark: "{",
+                                    type: "argument",
+                                },
+                            ],
+                            content: [
+                                {
+                                    content: "a",
+                                    type: "string",
+                                },
+                                {
+                                    content: "&",
+                                    type: "string",
+                                },
+                                {
+                                    content: "b",
+                                    type: "string",
+                                },
+                                {
+                                    args: [
+                                        {
+                                            closeMark: "",
+                                            content: [],
+                                            openMark: "",
+                                            type: "argument",
+                                        },
+                                        {
+                                            closeMark: "",
+                                            content: [],
+                                            openMark: "",
+                                            type: "argument",
+                                        },
+                                    ],
+                                    content: "\\",
+                                    type: "macro",
+                                },
+                                {
+                                    content: "x",
+                                    type: "string",
+                                },
+                                {
+                                    content: "&",
+                                    type: "string",
+                                },
+                                {
+                                    content: "y",
+                                    type: "string",
+                                },
+                            ],
+                            env: "array",
+                            type: "environment",
+                        },
+                        {
+                            content: "right",
+                            type: "macro",
+                        },
+                        {
+                            content: ".",
+                            type: "string",
+                        },
+                    ],
+                    type: "inlinemath",
+                },
+            ],
+            type: "root",
+        });
+    });
+});
diff --git a/packages/unified-latex-types/libs/info-specs.ts b/packages/unified-latex-types/libs/info-specs.ts
index 6957f313..40de5a82 100644
--- a/packages/unified-latex-types/libs/info-specs.ts
+++ b/packages/unified-latex-types/libs/info-specs.ts
@@ -123,6 +123,10 @@ export type MacroInfo = {
          * @type {boolean}
          */
         tikzPathCommand?: boolean;
+        /**
+         * If `\sysdelims` is present, this contains the global information about the delimiters.
+         */
+        sysdelims?: (Ast.Node[] | null)[];
     };
     /**
      * The macro signature as an xparse argument specification string.
diff --git a/packages/unified-latex-types/vite.config.ts b/packages/unified-latex-types/vite.config.ts
index 7cee3987..afbabc90 100644
--- a/packages/unified-latex-types/vite.config.ts
+++ b/packages/unified-latex-types/vite.config.ts
@@ -16,7 +16,7 @@ export default defineConfig(({ mode }) => {
     const plugins =
         mode === "commonjs"
             ? []
-            : [dts({ rollupTypes: true }), packageReadmeAndPackageJson()];
+            : [dts({ rollupTypes: false }), packageReadmeAndPackageJson()];
     console.log(`Building in mode: ${mode}.\n`);
 
     return {