diff --git a/Makefile b/Makefile
index 5f0a88c3..e04681f3 100644
--- a/Makefile
+++ b/Makefile
@@ -177,7 +177,7 @@ $(shell mkdir -p $(BUILD_DIR)/linker_scripts/$(VERSION) $(BUILD_DIR)/linker_scri
 
 
 # directory flags
-build/src/main/O2/%.o: OPTFLAGS := -O2
+build/src/libultra/2BDF0.o: OPTFLAGS := -O1 -g0
 
 # per-file flags