diff --git a/src/kits/interface/Jamfile b/src/kits/interface/Jamfile
index 96824f1ea2..9aa36f7bd9 100644
--- a/src/kits/interface/Jamfile
+++ b/src/kits/interface/Jamfile
@@ -4,6 +4,10 @@ SubDir OBOS_TOP src kits interface ;
 
 UsePrivateHeaders interface ;
 
+if ! $(HAIKU_COMPATIBLE) {
+	SubDirC++Flags -DCOMPILE_FOR_R5 ;
+}
+
 StaticLibrary haiku :
 	ScrollView.cpp
 	: STATIC_LIBRARY_DIR