diff --git a/pkgs/applications/radio/gnuradio/shared.nix b/pkgs/applications/radio/gnuradio/shared.nix
index f0f712e8a916..0488393bc989 100644
--- a/pkgs/applications/radio/gnuradio/shared.nix
+++ b/pkgs/applications/radio/gnuradio/shared.nix
@@ -126,6 +126,8 @@ in
   preCheck = ''
     export HOME=$(mktemp -d)
     export QT_QPA_PLATFORM=offscreen
+  ''
+  + lib.optionalString (hasFeature "gr-qtgui") ''
     export QT_PLUGIN_PATH="${qt.qtbase.bin}/${qt.qtbase.qtPluginPrefix}"
   '';