diff --git a/Makefile b/Makefile
index fb2e223..f34af02 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC = gcc
-CFLAGS = -O0 -I include 
+CFLAGS = -O0 -I include -std=c99
 
 DEBUG = true
 
@@ -30,4 +30,4 @@ clean:
 	rm -f libmultiaddr.a
 	rm -f test_multiaddr
 	
-rebuild: clean all
\ No newline at end of file
+rebuild: clean all