diff --git a/paddle/math/Matrix.h b/paddle/math/Matrix.h
index 395143a4b1af84882f51b40a494b64c7260542df..2c918f7b3a400654c1b212af5dd319a3a5618ea3 100644
--- a/paddle/math/Matrix.h
+++ b/paddle/math/Matrix.h
@@ -408,7 +408,7 @@ public:
     LOG(FATAL) << "Not implemented";
   }
 
-  virtual void addBias(Matrix& b, real scale, bool sharedBias) {
+  void addBias(Matrix& b, real scale, bool sharedBias) {
     if (!sharedBias) {
       addBias(b, scale);
     } else {
@@ -425,7 +425,7 @@ public:
     LOG(FATAL) << "Not implemented";
   }
 
-  virtual void collectBias(Matrix& a, real scale, bool sharedBias) {
+  void collectBias(Matrix& a, real scale, bool sharedBias) {
     if (!sharedBias) {
       collectBias(a, scale);
     } else {