diff --git a/tests/gtests/blenlib/BLI_heap_simple_test.cc b/tests/gtests/blenlib/BLI_heap_simple_test.cc
index 29aa8f23c49..9c97163f337 100644
--- a/tests/gtests/blenlib/BLI_heap_simple_test.cc
+++ b/tests/gtests/blenlib/BLI_heap_simple_test.cc
@@ -4,6 +4,7 @@
 #include <string.h>
 
 extern "C" {
+#include "BLI_sys_types.h"
 #include "BLI_compiler_attrs.h"
 #include "BLI_heap_simple.h"
 #include "BLI_utildefines.h"