diff --git a/js/src/config/config.mk b/js/src/config/config.mk
index f3d9ad60611d..4763b4c34f7d 100644
--- a/js/src/config/config.mk
+++ b/js/src/config/config.mk
@@ -56,8 +56,6 @@ space :=$(nullstr) # EOL
 
 core_winabspath = $(firstword $(subst /, ,$(call core_abspath,$(1)))):$(subst $(space),,$(patsubst %,\\%,$(wordlist 2,$(words $(subst /, ,$(call core_abspath,$(1)))), $(strip $(subst /, ,$(call core_abspath,$(1)))))))
 
-RM = rm -f
-
 # LIBXUL_DIST is not defined under js/src, thus we make it mean DIST there.
 LIBXUL_DIST ?= $(DIST)