diff --git a/pkg/jerryscript/Makefile.jerryscript b/pkg/jerryscript/Makefile.jerryscript
index f95fb72bc5..438ba108a9 100644
--- a/pkg/jerryscript/Makefile.jerryscript
+++ b/pkg/jerryscript/Makefile.jerryscript
@@ -4,6 +4,10 @@ JERRYHEAP  ?= 16
 
 EXT_CFLAGS :=-D__TARGET_RIOT
 
+ifeq ($(TOOLCHAIN)_$(BOARD),llvm_native)
+  EXT_CFLAGS :=-D__TARGET_RIOT -Wno-conversion
+endif
+
 .PHONY: libjerry riot-jerry flash clean
 
 # all: libjerry riot-jerry
diff --git a/pkg/nimble/Makefile b/pkg/nimble/Makefile
index 27899da60c..1116ec1d84 100644
--- a/pkg/nimble/Makefile
+++ b/pkg/nimble/Makefile
@@ -15,6 +15,7 @@ ifeq (llvm,$(TOOLCHAIN))
 # tell LLVM/clang not to be so pedantic with this.
   CFLAGS += -Wno-unused-function
   CFLAGS += -Wno-sometimes-uninitialized
+  CFLAGS += -Wno-address-of-packed-member
 else
   CFLAGS += -Wno-unused-but-set-variable
 endif