diff --git a/Source/PluginSpecs/CommonTypes.h b/Source/PluginSpecs/CommonTypes.h
index 8bd75dc1ea..b5f260ae0a 100644
--- a/Source/PluginSpecs/CommonTypes.h
+++ b/Source/PluginSpecs/CommonTypes.h
@@ -43,7 +43,9 @@ typedef signed __int64 s64;
 typedef unsigned char u8;
 typedef unsigned short u16;
 typedef unsigned int u32;
+#if !defined(OSX64)
 typedef unsigned int BOOL;
+#endif
 typedef unsigned long long u64;
 
 typedef char s8;