diff --git a/pkg/jerryscript/Makefile.jerryscript b/pkg/jerryscript/Makefile.jerryscript
index 2f11a8c48adcc241332cff69c2218d67bf61a73b..e03a6649f2f2446c7b1dc8b98d52a3ebb29fbfef 100644
--- a/pkg/jerryscript/Makefile.jerryscript
+++ b/pkg/jerryscript/Makefile.jerryscript
@@ -4,8 +4,6 @@ JERRYHEAP  ?= 16
 
 EXT_CFLAGS :=-D__TARGET_RIOT
 
-EXT_CFLAGS += $(CFLAGS)
-
 .PHONY: libjerry riot-jerry flash clean
 
 # all: libjerry riot-jerry