diff --git a/src/utils.c b/src/utils.c
index c36979c..5874077 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -31,6 +31,7 @@
 	}
 
 	snprintf(namebuf, sizeof(namebuf), "unknown 0x%x", val);
+	namebuf[sizeof(namebuf) - 1] = '\0';
 	return namebuf;
 }