diff --git a/utils/nfc-probe.c b/utils/nfc-probe.c
index 71f69a5..866bc02 100644
--- a/utils/nfc-probe.c
+++ b/utils/nfc-probe.c
@@ -59,7 +59,7 @@
 
 static nfc_device *pnd;
 
-void
+static void
 print_usage (const char* progname)
 {
   printf ("usage: %s [-v]\n", progname);