diff --git a/demos/AVR/NIL-ARDUINOMEGA/Makefile b/demos/AVR/NIL-ARDUINOMEGA/Makefile
index 9c2f14a3e..f1c364509 100644
--- a/demos/AVR/NIL-ARDUINOMEGA/Makefile
+++ b/demos/AVR/NIL-ARDUINOMEGA/Makefile
@@ -150,6 +150,7 @@ CFLAGS += -Wstrict-prototypes
 CFLAGS += -Wa,-adhlns=$(<:%.c=$(OBJDIR)/%.lst)
 CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
 CFLAGS += $(CSTANDARD)
+CFLAGS += -mrelax
 
 #---------------- Compiler Options C++ ----------------
 #  -g*:          generate debugging information
diff --git a/demos/AVR/RT-ARDUINOMEGA/Makefile b/demos/AVR/RT-ARDUINOMEGA/Makefile
index a4d4bd621..feae77037 100644
--- a/demos/AVR/RT-ARDUINOMEGA/Makefile
+++ b/demos/AVR/RT-ARDUINOMEGA/Makefile
@@ -151,6 +151,7 @@ CFLAGS += -Wstrict-prototypes
 CFLAGS += -Wa,-adhlns=$(<:%.c=$(OBJDIR)/%.lst)
 CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
 CFLAGS += $(CSTANDARD)
+CFLAGS += -mrelax
 
 #---------------- Compiler Options C++ ----------------
 #  -g*:          generate debugging information