diff --git a/Tools/Source/GenBuild/org/tianocore/build/global/GlobalData.java b/Tools/Source/GenBuild/org/tianocore/build/global/GlobalData.java
index e8da51231f..e5e4d5e671 100644
--- a/Tools/Source/GenBuild/org/tianocore/build/global/GlobalData.java
+++ b/Tools/Source/GenBuild/org/tianocore/build/global/GlobalData.java
@@ -726,7 +726,7 @@ public class GlobalData {
         return false;
     }
 
-    public static String getCommandSetting(String[] commandDescription, FpdModuleIdentification fpdModuleId) throws EdkException {
+    public synchronized static String getCommandSetting(String[] commandDescription, FpdModuleIdentification fpdModuleId) throws EdkException {
         ToolChainKey toolChainKey = new ToolChainKey(commandDescription);
         ToolChainMap toolChainConfig = toolsDef.getConfig();
         String setting = null;