diff --git a/React/Executors/RCTJSCExecutor.mm b/React/Executors/RCTJSCExecutor.mm
index f45067eb3d194e..3bad2ee2d895dc 100644
--- a/React/Executors/RCTJSCExecutor.mm
+++ b/React/Executors/RCTJSCExecutor.mm
@@ -543,7 +543,7 @@ - (void)invalidate
 
 - (int32_t)bytecodeFileFormatVersion
 {
-  return _tryBytecode
+  return (_useCustomJSCLibrary && _tryBytecode)
     ? facebook::react::customJSCWrapper()->JSBytecodeFileFormatVersion
     : JSNoBytecodeFileFormatVersion;
 }