diff --git a/lib/cli/run-helpers.js b/lib/cli/run-helpers.js
index 46714a1e35..761546a4f5 100644
--- a/lib/cli/run-helpers.js
+++ b/lib/cli/run-helpers.js
@@ -217,10 +217,8 @@ exports.runMocha = async (mocha, options) => {
 
   const files = collectFiles(fileCollectParams);
   if(files.length===1) {
-    if(options.parallel && !options.parallelForce) {
-      mocha.parallelMode(false);
-      parallel=false;
-    }
+    mocha.parallelMode(false);
+    parallel=false;
   }
   
   let run;