diff --git a/apps/nsq_to_http/nsq_to_http.go b/apps/nsq_to_http/nsq_to_http.go
index 22ab5abc3..df6bcd927 100644
--- a/apps/nsq_to_http/nsq_to_http.go
+++ b/apps/nsq_to_http/nsq_to_http.go
@@ -176,7 +176,7 @@ func main() {
 		var err error
 		validCustomHeaders, err = parseCustomHeaders(customHeaders)
 		if err != nil {
-			log.Fatal("--header value format should be 'key=value'")
+			log.Fatal("--header value format should be 'key: value'")
 		}
 	}