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-rw-r--r--cpp/020call2
1 files changed, 1 insertions, 1 deletions
diff --git a/cpp/020call b/cpp/020call
index 22548b8d..2e0000c0 100644
--- a/cpp/020call
+++ b/cpp/020call
@@ -45,7 +45,7 @@ inline vector<instruction>& steps(routine& rr) {
 default: {
   // not a primitive; try to look for a matching recipe
   if (Recipe.find(instructions[pc].operation) == Recipe.end()) {
-    raise << "undefined operation " << instructions[pc].operation << '\n';
+    raise << "undefined operation " << instructions[pc].operation << ": " << instructions[pc].name << '\n';
     break;
   }
   rr.calls.push(call(instructions[pc].operation));