diff --git a/Tools/Java/Source/GenBuild/org/tianocore/build/FrameworkBuildTask.java b/Tools/Java/Source/GenBuild/org/tianocore/build/FrameworkBuildTask.java
index 44eec53216..1165263898 100644
--- a/Tools/Java/Source/GenBuild/org/tianocore/build/FrameworkBuildTask.java
+++ b/Tools/Java/Source/GenBuild/org/tianocore/build/FrameworkBuildTask.java
@@ -375,7 +375,10 @@ public class FrameworkBuildTask extends Task{
         }
 
         str = getValue(ToolDefinitions.TARGET_KEY_MAX_CONCURRENT_THREAD_NUMBER, targetFileInfo);
-        if (str != null ) {
+        //
+        // Need to check the # of threads iff multithread is enabled.
+        //
+        if ((multithread) && (str != null )) {
             try {
                 int threadNum = Integer.parseInt(str);
                 if (threadNum > 0) {