diff --git a/pkgs/applications/misc/gnuradio/default.nix b/pkgs/applications/misc/gnuradio/default.nix
index 470e046e85e5..58d8e9fae618 100644
--- a/pkgs/applications/misc/gnuradio/default.nix
+++ b/pkgs/applications/misc/gnuradio/default.nix
@@ -63,7 +63,7 @@ stdenv.mkDerivation rec {
     addGRCBlocksPath() {
       addToSearchPath GRC_BLOCKS_PATH $1/share/gnuradio/grc/blocks
     }
-    envHooks+=(addGRCBlocksPath)
+    addEnvHooks "$targetOffset" addGRCBlocksPath
   '';
 
   setupHook = [ grcSetupHook ];