diff --git a/sx_slentry.c b/sx_slentry.c
index 2aa1aa8..20d823e 100644
--- a/sx_slentry.c
+++ b/sx_slentry.c
@@ -24,6 +24,7 @@
  * SUCH DAMAGE.
  */
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>