diff --git a/Source/PluginSpecs/CommonTypes.h b/Source/PluginSpecs/CommonTypes.h
index 984e176611..09c1cb2cf0 100644
--- a/Source/PluginSpecs/CommonTypes.h
+++ b/Source/PluginSpecs/CommonTypes.h
@@ -43,9 +43,7 @@ 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 signed int BOOL;
 typedef unsigned long long u64;
 
 typedef char s8;