diff --git a/blas/level3_impl.h b/blas/level3_impl.h
index 07dbc22ff..a05872666 100644
--- a/blas/level3_impl.h
+++ b/blas/level3_impl.h
@@ -56,7 +56,7 @@ int EIGEN_BLAS_FUNC(gemm)(char *opa, char *opb, int *m, int *n, int *k, RealScal
     else                matrix(c, *m, *n, *ldc) *= beta;
   }
 
-  internal::gemm_blocking_space<ColMajor,Scalar,Scalar,Dynamic,Dynamic,Dynamic> blocking(*m,*n,*k);
+  internal::gemm_blocking_space<ColMajor,Scalar,Scalar,Dynamic,Dynamic,Dynamic> blocking(*m,*n,*k,true);
 
   int code = OP(*opa) | (OP(*opb) << 2);
   func[code](*m, *n, *k, a, *lda, b, *ldb, c, *ldc, alpha, blocking, 0);