diff --git a/src/latency.c b/src/latency.c
index a8f7c01d..d9c422ad 100644
--- a/src/latency.c
+++ b/src/latency.c
@@ -228,6 +228,6 @@ nodataerr:
     /* Common error when the user asks for an event we have no latency
      * information about. */
     addReplyErrorFormat(c,
-        "No samples available for event '%s'", c->argv[2]->ptr);
+        "No samples available for event '%s'", (char*) c->argv[2]->ptr);
 }