diff --git a/compiler/include/concretelang/TestLib/TestTypedLambda.h b/compiler/include/concretelang/TestLib/TestTypedLambda.h
index cb9e55de1..235b65c83 100644
--- a/compiler/include/concretelang/TestLib/TestTypedLambda.h
+++ b/compiler/include/concretelang/TestLib/TestTypedLambda.h
@@ -83,7 +83,7 @@ public:
       std::ostringstream serverOutput(BINARY);
       OUTCOME_TRYV(serverLambda.read_call_write(serverInput, serverOutput));
       if (serverInput.fail()) {
-        return StringError("Error on serverOutput");
+        return StringError("Error on serverInput");
       }
       if (serverOutput.fail()) {
         return StringError("Error on serverOutput");