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-rw-r--r--src/libexpr/primops.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index b0596dad9470..e7b79604699b 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -187,6 +187,9 @@ static void prim_typeOf(EvalState & state, const Pos & pos, Value * * args, Valu
         case tPrimOpApp:
             t = "lambda";
             break;
+	case tExternal:
+            t = args[0]->external->typeOf();
+            break;
         default: abort();
     }
     mkString(v, state.symbols.create(t));