1 files changed, 1 insertions, 1 deletions
diff --git a/gr-blocks/lib/min_blk_impl.h b/gr-blocks/lib/min_blk_impl.h
index f6f46b95e1..c49082dc5b 100644
--- a/gr-blocks/lib/min_blk_impl.h
+++ b/gr-blocks/lib/min_blk_impl.h
@@ -21,7 +21,7 @@ template <class T>
 class min_blk_impl : public min_blk<T>
 {
 private:
-    size_t d_vlen, d_vlen_out;
+    const size_t d_vlen, d_vlen_out;
 
 public:
     min_blk_impl(size_t vlen, size_t vlen_out);