diff --git a/src/libstore/build-result.hh b/src/libstore/build-result.hh
index e50ddbb8c..a12c599d9 100644
--- a/src/libstore/build-result.hh
+++ b/src/libstore/build-result.hh
@@ -53,6 +53,7 @@ struct BuildResult
                 case LogLimitExceeded: return "LogLimitExceeded";
                 case NotDeterministic: return "NotDeterministic";
                 case ResolvesToAlreadyValid: return "ResolvesToAlreadyValid";
+                case NoSubstituters: return "NoSubstituters";
                 default: return "Unknown";
             };
         }();