diff --git a/tools/cache/mutation_cache.go b/tools/cache/mutation_cache.go
index 0fa06bf7..cbb6434e 100644
--- a/tools/cache/mutation_cache.go
+++ b/tools/cache/mutation_cache.go
@@ -156,7 +156,7 @@ func (c *mutationCache) ByIndex(name string, indexKey string) ([]interface{}, er
 			}
 			elements, err := fn(updated)
 			if err != nil {
-				glog.V(4).Info("Unable to calculate an index entry for mutation cache entry %s: %v", key, err)
+				glog.V(4).Infof("Unable to calculate an index entry for mutation cache entry %s: %v", key, err)
 				continue
 			}
 			for _, inIndex := range elements {