diff --git a/Tools/Source/FrameworkTasks/org/tianocore/framework/tasks/GenSectionTask.java b/Tools/Source/FrameworkTasks/org/tianocore/framework/tasks/GenSectionTask.java
index bb477f031e..fc5ebbf3dc 100644
--- a/Tools/Source/FrameworkTasks/org/tianocore/framework/tasks/GenSectionTask.java
+++ b/Tools/Source/FrameworkTasks/org/tianocore/framework/tasks/GenSectionTask.java
@@ -299,6 +299,8 @@ public class GenSectionTask extends Task implements EfiDefine, Section,FfsTypes
                 //  Call compress
                 //
                 byte[] fileBuffer = bo.toByteArray();
+                
+                synchronized (CompressSection.semaphore) {
                 Compress myCompress = new Compress(fileBuffer, fileBuffer.length);            
                 
                 //
@@ -349,6 +351,7 @@ public class GenSectionTask extends Task implements EfiDefine, Section,FfsTypes
                     size ++;
                     buffer.writeByte(0);
                 }
+                }
             }
             catch (Exception e){
                 throw new BuildException("compress.toBuffer failed!\n");