1 files changed, 1 insertions, 1 deletions
diff --git a/gr-blocks/lib/argmax_impl.h b/gr-blocks/lib/argmax_impl.h
index c4de0bd38a..7146a42ead 100644
--- a/gr-blocks/lib/argmax_impl.h
+++ b/gr-blocks/lib/argmax_impl.h
@@ -32,7 +32,7 @@ template <class T>
 class argmax_impl : public argmax<T>
 {
 private:
-    size_t d_vlen;
+    const size_t d_vlen;
 
 public:
     argmax_impl(size_t vlen);