diff --git a/pkgs/tools/security/pinentry/qt5.nix b/pkgs/tools/security/pinentry/qt5.nix
index d0811cdd11af..18648633a097 100644
--- a/pkgs/tools/security/pinentry/qt5.nix
+++ b/pkgs/tools/security/pinentry/qt5.nix
@@ -22,8 +22,8 @@ stdenv.mkDerivation rec {
 
   # configure cannot find moc on its own
   preConfigure = ''
-    export QTDIR="${qtbase}"
-    export MOC="${qtbase}/bin/moc"
+    export QTDIR="${qtbase.dev}"
+    export MOC="${qtbase.dev}/bin/moc"
   '';
 
   configureFlags = [