diff --git a/lib/Serialization/Deserialization.cpp b/lib/Serialization/Deserialization.cpp
index 1e89fd4a67926..1644d4e453755 100644
--- a/lib/Serialization/Deserialization.cpp
+++ b/lib/Serialization/Deserialization.cpp
@@ -1724,7 +1724,7 @@ ModuleFile::getGenericSignatureChecked(serialization::GenericSignatureID ID) {
   }
   default:
     // Not a generic signature; no way to recover.
-    fatal(llvm::make_error<InvalidRecordKindError>(recordID));
+    return diagnoseFatal(llvm::make_error<InvalidRecordKindError>(recordID));
   }
 
   // If we've already deserialized this generic signature, start over to return