diff --git a/credentialz/credentialz.proto b/credentialz/credentialz.proto
index 192dd12..48d4ed3 100644
--- a/credentialz/credentialz.proto
+++ b/credentialz/credentialz.proto
@@ -690,7 +690,7 @@ message GlomeRequest {
   bool enabled = 1;
   string key = 2;
   int32 key_version = 2;
-  string url-prefix = 3;
+  string url_prefix = 3;
 }
 
 message GlomeResponse {