diff --git a/Makefile b/Makefile
index 145e1f7d..65345527 100644
--- a/Makefile
+++ b/Makefile
@@ -630,7 +630,8 @@ $(BUILD_DIR)/src/usb/usb.o: CFLAGS += -Wno-unused-variable -Wno-sign-compare -Wn
 $(BUILD_DIR)/src/usb/debug.o: OPT_FLAGS := -O0
 $(BUILD_DIR)/src/usb/debug.o: CFLAGS += -Wno-unused-parameter -Wno-maybe-uninitialized
 # File specific opt flags
-$(BUILD_DIR)/src/audio/*.o:                   OPT_FLAGS := -Os -fno-jump-tables
+$(BUILD_DIR)/src/audio/heap.o:          OPT_FLAGS := -Os -fno-jump-tables
+$(BUILD_DIR)/src/audio/synthesis.o:     OPT_FLAGS := -Os -fno-jump-tables
 
 $(BUILD_DIR)/src/engine/surface_collision.o:  OPT_FLAGS := $(COLLISION_OPT_FLAGS)
 $(BUILD_DIR)/src/engine/math_util.o:          OPT_FLAGS := $(MATH_UTIL_OPT_FLAGS)