diff --git a/headers/build/HaikuBuildCompatibility.h b/headers/build/HaikuBuildCompatibility.h
index 89c002f39b..0e35c43a8a 100644
--- a/headers/build/HaikuBuildCompatibility.h
+++ b/headers/build/HaikuBuildCompatibility.h
@@ -55,6 +55,7 @@ extern float	roundf(float value);
 
 #ifdef HAIKU_TARGET_PLATFORM_BEOS
 #	define B_BAD_DATA (B_NOT_ALLOWED+1)
+#	define B_REDO 'REDO'
 #endif
 
 #endif	// HAIKU_BUILD_COMPATIBILITY_H