diff --git a/desmume/src/types.h b/desmume/src/types.h
index 9903e2d54..8a0d52a04 100644
--- a/desmume/src/types.h
+++ b/desmume/src/types.h
@@ -70,4 +70,14 @@ typedef signed long long s64;
 #endif
 #endif
 
+typedef int BOOL;
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
 #endif