diff --git a/defs/gmake.mk b/defs/gmake.mk
index 929238af7b..f7260d0b47 100644
--- a/defs/gmake.mk
+++ b/defs/gmake.mk
@@ -11,7 +11,10 @@ override ACTIONS_GROUP = @echo "\#\#[group]$(patsubst yes-%,%,$@)"
 override ACTIONS_ENDGROUP = @echo "\#\#[endgroup]"
 endif
 
-ifneq ($(filter %darwin%,$(arch)),)
+ifneq ($(filter darwin%,$(target_os)),)
+# Remove debug option not to generate thousands of .dSYM
+MJIT_DEBUGFLAGS := $(filter-out -g%,$(MJIT_DEBUGFLAGS))
+
 INSTRUBY_ENV += SDKROOT=/
 endif
 INSTRUBY_ARGS += --gnumake