diff --git a/core/Makefile b/core/Makefile
index 35773bf78..6947624c8 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -589,7 +589,7 @@ INTERNAL_USERIMAGES_BINARY_PATHS := $(sort $(dir $(INTERNAL_USERIMAGES_DEPS)))
 # $(5): size of the partition
 define build-userimage-ext-target
   @mkdir -p $(dir $(2))
-  $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$(PATH) \
+  $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
 	  $(MKEXTUSERIMG) $(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG) $(1) $(2) $(4) $(3) $(5)
 endef
 else