diff --git a/src/spatVector.cpp b/src/spatVector.cpp
index 19ce9fe9c..5b22b7c5d 100644
--- a/src/spatVector.cpp
+++ b/src/spatVector.cpp
@@ -21,6 +21,7 @@
 #include "math_utils.h"
 #include "vecmath.h"
 #include "recycle.h"
+#include <unordered_map>
 
 #ifdef useGDAL
 	#include "crs.h"
diff --git a/src/vecmath.h b/src/vecmath.h
index 9f84c7a60..8e1c16590 100644
--- a/src/vecmath.h
+++ b/src/vecmath.h
@@ -28,6 +28,7 @@
 
 #include <map>
 #include <algorithm>
+#include <unordered_map>
 
 
 bool haveFun(std::string fun);