diff --git a/source/common/utility/vectors.h b/source/common/utility/vectors.h
index 8d5b4a3a3..2851419ea 100644
--- a/source/common/utility/vectors.h
+++ b/source/common/utility/vectors.h
@@ -47,6 +47,7 @@
 #include "xs_Float.h"
 #include "math/cmath.h"
 #include "basics.h"
+#include "cmdlib.h"
 
 
 #define EQUAL_EPSILON (1/65536.)