diff --git a/emulators/generator-cbiere/Makefile b/emulators/generator-cbiere/Makefile
index a913ea5a68be..7ffcd89dc2c7 100644
--- a/emulators/generator-cbiere/Makefile
+++ b/emulators/generator-cbiere/Makefile
@@ -55,6 +55,10 @@ CONFIGURE_ARGS+=--with-cmz80
 CONFIGURE_ARGS+=--with-sdl-audio
 .endif
 
+post-patch:
+	@${REINPLACE_CMD} -e '/%define %1 @UNDERSCORE@%1 /d' \
+		${WRKSRC}/raze/raze.asm.in
+
 post-install:
 	@${ECHO_CMD}
 	@${CAT} ${PKGMESSAGE}
diff --git a/emulators/generator/Makefile b/emulators/generator/Makefile
index 778117fde650..d86f7608ddbc 100644
--- a/emulators/generator/Makefile
+++ b/emulators/generator/Makefile
@@ -65,6 +65,10 @@ CONFIGURE_ARGS+=--with-cmz80
 CONFIGURE_ARGS+=--with-sdl-audio
 .endif
 
+post-patch:
+	@${REINPLACE_CMD} -e '/%define %1 @UNDERSCORE@%1 /d' \
+		${WRKSRC}/raze/raze.asm.in
+
 post-install:
 	@${ECHO_CMD}
 	@${CAT} ${PKGMESSAGE}