diff --git a/du6/program.c b/du6/program.c
index d61f794..40582ea 100644
--- a/du6/program.c
+++ b/du6/program.c
@@ -1,4 +1,4 @@
-include <stdio.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>