diff --git a/src/math/pimathmatrix.h b/src/math/pimathmatrix.h
index 82487e28..8e96acb8 100644
--- a/src/math/pimathmatrix.h
+++ b/src/math/pimathmatrix.h
@@ -248,8 +248,8 @@ inline PIMathMatrixT<Rows0, Cols1, Type> operator *(const PIMathMatrixT<Rows0, C
 
 /// Multiply matrix {Rows x Cols} on vector {Cols}, result is vector {Rows}
 template<uint Cols, uint Rows, typename Type>
-inline PIMathVectorT<Cols, Type> operator *(const PIMathMatrixT<Rows, Cols, Type> & fm,
-											const PIMathVectorT<Rows, Type> & sv) {
+inline PIMathVectorT<Rows, Type> operator *(const PIMathMatrixT<Rows, Cols, Type> & fm,
+											const PIMathVectorT<Cols, Type> & sv) {
 	PIMathVectorT<Rows, Type> tv;
 	Type t;
 	for (uint j = 0; j < Rows; ++j) {
@@ -261,21 +261,20 @@ inline PIMathVectorT<Cols, Type> operator *(const PIMathMatrixT<Rows, Cols, Type
 	return tv;
 }
 
-/*
-/// Multiply vector {Cols}T on matrix {Rows x Cols}, result is vector {Rows}T
+/// Multiply vector {Rows} on matrix {Rows x Cols}, result is vector {Cols}
 template<uint Cols, uint Rows, typename Type>
-inline PIMathVectorT<Cols, Type> operator *(const PIMathMatrixT<Rows, Cols, Type> & fm,
-											const PIMathVectorT<Rows, Type> & sv) {
-	PIMathVectorT<Rows, Type> tv;
+inline PIMathVectorT<Cols, Type> operator *(const PIMathVectorT<Rows, Type> & sv,
+											const PIMathMatrixT<Rows, Cols, Type> & fm) {
+	PIMathVectorT<Cols, Type> tv;
 	Type t;
-	for (uint j = 0; j < Rows; ++j) {
+	for (uint j = 0; j < Cols; ++j) {
 		t = Type(0);
-		for (uint i = 0; i < Cols; ++i)
-			t += fm[j][i] * sv[i];
+		for (uint i = 0; i < Rows; ++i)
+			t += fm[i][j] * sv[i];
 		tv[j] = t;
 	}
 	return tv;
-}*/
+}
 
 /// Multiply value(T) on matrix {Rows x Cols}, result is vector {Rows}
 template<uint Cols, uint Rows, typename Type>