diff --git a/Makefile.include b/Makefile.include
index 3ed193316..4933d204e 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -192,7 +192,7 @@ rm -f $(@:.o=.$$$$)
 endef
 
 clean:
-	rm -f *~ *core core *.srec \
+	-rm -f *~ *core core *.srec \
 	*.lst *.map \
 	*.cprg *.bin *.data contiki*.a *.firmware core-labels.S *.ihex *.ini \
 	*.ce *.co