1 files changed, 3 insertions, 3 deletions
diff --git a/gr-blocks/lib/file_descriptor_source_impl.h b/gr-blocks/lib/file_descriptor_source_impl.h
index b058fe1918..537dd84e42 100644
--- a/gr-blocks/lib/file_descriptor_source_impl.h
+++ b/gr-blocks/lib/file_descriptor_source_impl.h
@@ -31,9 +31,9 @@ namespace blocks {
 class file_descriptor_source_impl : public file_descriptor_source
 {
 private:
-    size_t d_itemsize;
-    int d_fd;
-    bool d_repeat;
+    const size_t d_itemsize;
+    const int d_fd;
+    const bool d_repeat;
 
     std::vector<unsigned char> d_residue;
     unsigned long d_residue_len;