diff --git a/sc2/src/types.h b/sc2/src/types.h
index db58630b6..b2992191d 100644
--- a/sc2/src/types.h
+++ b/sc2/src/types.h
@@ -103,9 +103,11 @@ extern "C" {
 #ifndef HAVE__BOOL
 typedef unsigned char _Bool;
 #endif  /* HAVE_BOOL */
+#ifndef __cplusplus
 #define bool _Bool
 #define true 1
 #define false 0
+#endif
 #define __bool_true_false_are_defined
 #endif  /* __bool_true_false_are_defined */