diff --git a/source/blender/blenkernel/BKE_idprop.h b/source/blender/blenkernel/BKE_idprop.h
index 3f7d9498e39..d84bb1fd25e 100644
--- a/source/blender/blenkernel/BKE_idprop.h
+++ b/source/blender/blenkernel/BKE_idprop.h
@@ -7,6 +7,7 @@
  */
 
 #include "BLI_compiler_attrs.h"
+#include "BLI_sys_types.h"
 
 #ifdef __cplusplus
 extern "C" {