diff --git a/tests/basics/CMakeLists.txt b/tests/basics/CMakeLists.txt
index d85d924..e50172b 100644
--- a/tests/basics/CMakeLists.txt
+++ b/tests/basics/CMakeLists.txt
@@ -27,6 +27,7 @@ set_tests_properties(${_macros_extra} PROPERTIES LABELS extra)
 
 list(TRANSFORM _macros_vis PREPEND "basics/")
 set_tests_properties(${_macros_vis} PROPERTIES LABELS vis)
+set_tests_properties(${_macros_vis} PROPERTIES SKIP_REGULAR_EXPRESSION "couldn't open display")
 
 # further specific tests.
 
diff --git a/tests/confinement/CMakeLists.txt b/tests/confinement/CMakeLists.txt
index f016bef..180a4b3 100644
--- a/tests/confinement/CMakeLists.txt
+++ b/tests/confinement/CMakeLists.txt
@@ -24,4 +24,6 @@ foreach(_mac ${_macros})
            COMMAND remage-cli -g gdml/geometry.gdml -o test-out.root -- macros/_vis.mac
                    macros/${_mac} macros/_vis-export.mac)
   set_tests_properties(confinement-vis/${_mac} PROPERTIES LABELS vis)
+  set_tests_properties(confinement-vis/${_mac} PROPERTIES SKIP_REGULAR_EXPRESSION
+                                                          "couldn't open display")
 endforeach()