diff --git a/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtr.h b/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtr.h
index 75b4c86cbf..df89d8ff6d 100644
--- a/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtr.h
+++ b/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtr.h
@@ -58,8 +58,8 @@ public:
 //  7-Apr-97 133MR1
 //	     Fix suggested by Andreas Magnusson
 //			(Andreas.Magnusson@mailbox.swipnet.se)
-    void operator = (const ANTLRTokenPtr & lhs);		    	// MR1
-    void operator = (ANTLRAbstractToken *addr);
+    ANTLRTokenPtr& operator = (const ANTLRTokenPtr & lhs);      // MR1
+    ANTLRTokenPtr& operator = (ANTLRAbstractToken *addr);
     int operator != (const ANTLRTokenPtr &q) const	    		// MR1 // MR11 unsigned -> int
 	{ return this->ptr_ != q.ptr_; }
     int operator == (const ANTLRTokenPtr &q) const  			// MR1 // MR11 unsigned -> int
diff --git a/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtrImpl.h b/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtrImpl.h
index 9c07cf52a9..a1efc3b3b9 100644
--- a/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtrImpl.h
+++ b/BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtrImpl.h
@@ -71,18 +71,20 @@ ANTLRTokenPtr::~ANTLRTokenPtr()
 //  8-Apr-97	MR1	Make operator -> a const member function
 //			  as weall as some other member functions
 //
-void ANTLRTokenPtr::operator = (const ANTLRTokenPtr & lhs)	// MR1
+ANTLRTokenPtr& ANTLRTokenPtr::operator = (const ANTLRTokenPtr & lhs)    // MR1
 {
     lhs.ref();	// protect against "xp = xp"; ie same underlying object
     deref();
     ptr_ = lhs.ptr_;
+    return *this;
 }
 
-void ANTLRTokenPtr::operator = (ANTLRAbstractToken *addr)
+ANTLRTokenPtr& ANTLRTokenPtr::operator = (ANTLRAbstractToken *addr)
 {
     if (addr != NULL) {
 	addr->ref();
     }
     deref();
     ptr_ = addr;
+    return *this;
 }