diff --git a/Makefile b/Makefile
index d433f10..8859063 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ APXS ?= apxs
 
 # Compiler settings
 CC ?= gcc
-CFLAGS ?= -Wall -Wextra -O2
+CFLAGS ?= -Wall -Wextra -O2 -std=gnu11 -x c
 
 # Directories
 SRC_DIR = src