diff --git a/pkgs/applications/networking/instant-messengers/gajim/default.nix b/pkgs/applications/networking/instant-messengers/gajim/default.nix
index af4f0db0724e..228bc1b97505 100644
--- a/pkgs/applications/networking/instant-messengers/gajim/default.nix
+++ b/pkgs/applications/networking/instant-messengers/gajim/default.nix
@@ -34,8 +34,8 @@ rec {
       name="''${name##*/.}"
       mv "$i" "$out/bin-wrapped/$name"
       sed -e 's^'"$i"'^'"$out/bin-wrapped/$name"'^' -i "$out/bin/$name"
-      sed -e "2aexport LD_LIBRARY_PATH=\"$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}${a.gtkspell}/lib:${a.gtkspell}/lib64\"" -i "$out/bin/gajim"
-      sed -e "2aexport NIX_LDFLAGS=\"$NIX_LDFLAGS -L${a.gtkspell}/lib -L${a.gtkspell}/lib64\"" -i "$out/bin/gajim"
+      sed -e "2aexport LD_LIBRARY_PATH=\"\$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}${a.gtkspell}/lib:${a.gtkspell}/lib64\"" -i "$out/bin/gajim"
+      sed -e "2aexport NIX_LDFLAGS=\"\$NIX_LDFLAGS -L${a.gtkspell}/lib -L${a.gtkspell}/lib64\"" -i "$out/bin/gajim"
     done
   '') ["wrapBinContentsPython"];