diff --git a/source/blender/editors/space_outliner/outliner.c b/source/blender/editors/space_outliner/outliner.c
index 2c1ba148643..bd2d591a8c8 100644
--- a/source/blender/editors/space_outliner/outliner.c
+++ b/source/blender/editors/space_outliner/outliner.c
@@ -57,6 +57,7 @@
 
 #include "BLI_blenlib.h"
 #include "BLI_utildefines.h"
+#include "BLI_math_base.h"
 
 #if defined WIN32 && !defined _LIBC
 # include "BLI_fnmatch.h" /* use fnmatch included in blenlib */
diff --git a/source/gameengine/Converter/KX_ConvertActuators.cpp b/source/gameengine/Converter/KX_ConvertActuators.cpp
index 41136f837f5..87d6c619229 100644
--- a/source/gameengine/Converter/KX_ConvertActuators.cpp
+++ b/source/gameengine/Converter/KX_ConvertActuators.cpp
@@ -77,6 +77,7 @@
 /* This little block needed for linking to Blender... */
 #include "BKE_text.h"
 #include "BLI_blenlib.h"
+#include "BLI_math_base.h"
 
 #define FILE_MAX 240 // repeated here to avoid dependency from BKE_utildefines.h