diff --git a/modules/gdnative/include/gdnative/math_defs.h b/modules/gdnative/include/gdnative/math_defs.h
index 05de157dd0..b5cf389506 100644
--- a/modules/gdnative/include/gdnative/math_defs.h
+++ b/modules/gdnative/include/gdnative/math_defs.h
@@ -35,6 +35,7 @@
 extern "C" {
 #endif
 
+#include <stdbool.h>
 #include <stdint.h>
 
 ////// bool