diff --git a/Makefile b/Makefile
index a2462f3..ec93166 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,3 @@
 all:
 	mkdir -p bin/
-	$(CC) -o bin/foxpc -O2 -Wall -Wextra -Wpedantic src/*.c
+	$(CC) -o bin/foxpc -O2 -Wall -Wextra -Wpedantic -std=c99 src/*.c