diff --git a/Makefile b/Makefile
index 89454a4fb..719ebb9e2 100644
--- a/Makefile
+++ b/Makefile
@@ -152,9 +152,9 @@ RGBLINK := $(RGBDS)rgblink
 RGBGFX  := $(RGBDS)rgbgfx
 
 # RGBASM 0.7+ deprecate and remove `-h`
-RGBASM_FLAGS = $(if $(filter $(shell echo 'println __RGBDS_MAJOR__ || (!__RGBDS_MAJOR__ && __RGBDS_MINOR__ > 6)' | $(RGBASM) -), $$0), -h,) --include $(OBJ)/BootROMs/ --include BootROMs/
+RGBASM_FLAGS := $(if $(filter $(shell echo 'println __RGBDS_MAJOR__ || (!__RGBDS_MAJOR__ && __RGBDS_MINOR__ > 6)' | $(RGBASM) -), $$0), -h,) --include $(OBJ)/BootROMs/ --include BootROMs/
 # RGBGFX 0.6+ replace `-h` with `-Z`, and need `-c embedded`
-RGBGFX_FLAGS = $(if $(filter $(shell echo 'println __RGBDS_MAJOR__ || (!__RGBDS_MAJOR__ && __RGBDS_MINOR__ > 5)' | $(RGBASM) -), $$0), -h -u, -Z -u -c embedded)
+RGBGFX_FLAGS := $(if $(filter $(shell echo 'println __RGBDS_MAJOR__ || (!__RGBDS_MAJOR__ && __RGBDS_MINOR__ > 5)' | $(RGBASM) -), $$0), -h -u, -Z -u -c embedded)
 
 
 # Set compilation and linkage flags based on target, platform and configuration