diff --git a/timeserver/Makefile b/timeserver/Makefile
index 728ddbf..6f7d8b7 100644
--- a/timeserver/Makefile
+++ b/timeserver/Makefile
@@ -1,4 +1,4 @@
-CC = gcc -Wall -std=c99 -pedantic
+CC = gcc -Wall -std=c11 -pedantic
 SOURCES = timeserver.c 
 OBJECTS = timeserver.o