diff --git a/core/java/com/android/internal/protolog/ProtoLogViewerConfigReader.java b/core/java/com/android/internal/protolog/ProtoLogViewerConfigReader.java
index dd6c879..3c201fc 100644
--- a/core/java/com/android/internal/protolog/ProtoLogViewerConfigReader.java
+++ b/core/java/com/android/internal/protolog/ProtoLogViewerConfigReader.java
@@ -179,6 +179,6 @@
             }
         }
 
-        throw new RuntimeException("Group " + group + "not found in viewer config");
+        throw new RuntimeException("Group " + group + " not found in viewer config");
     }
 }