diff --git a/lib/TransformNormalModulePlugin.js b/lib/TransformNormalModulePlugin.js
index 5b2a53dc..7c371e61 100644
--- a/lib/TransformNormalModulePlugin.js
+++ b/lib/TransformNormalModulePlugin.js
@@ -579,7 +579,7 @@ class TransformNormalModulePlugin {
           const hashDigest = outputOptions.hashDigest;
           const hashDigestLength = outputOptions.hashDigestLength;
 
-          if (module.buildInfo && module._initBuildHash) {
+          if (module.buildInfo && module._initBuildHash && module._buildHash === '') {
             module._initBuildHash(extra.compilation);
           }