1 files changed, 1 insertions, 1 deletions
diff --git a/gr-blocks/lib/max_blk_impl.h b/gr-blocks/lib/max_blk_impl.h
index 9100aa4d0a..aba0b3e758 100644
--- a/gr-blocks/lib/max_blk_impl.h
+++ b/gr-blocks/lib/max_blk_impl.h
@@ -21,7 +21,7 @@ template <class T>
 class max_blk_impl : public max_blk<T>
 {
 private:
-    size_t d_vlen, d_vlen_out;
+    const size_t d_vlen, d_vlen_out;
 
 public:
     max_blk_impl(size_t vlen, size_t vlen_out);