diff --git a/pkgs/tools/misc/heimdall/default.nix b/pkgs/tools/misc/heimdall/default.nix
index f84ccce4eb9..09018108d89 100644
--- a/pkgs/tools/misc/heimdall/default.nix
+++ b/pkgs/tools/misc/heimdall/default.nix
@@ -18,9 +18,9 @@ stdenv.mkDerivation {
   '';
   enableParallelBuilding = true;
   cmakeFlags = [
-    "-DQt5Widgets_DIR=${qt5.qtbase}/lib/cmake/Qt5Widgets"
-    "-DQt5Gui_DIR=${qt5.qtbase}/lib/cmake/Qt5Gui"
-    "-DQt5Core_DIR=${qt5.qtbase}/lib/cmake/Qt5Core"
+    "-DQt5Widgets_DIR=${qt5.qtbase.dev}/lib/cmake/Qt5Widgets"
+    "-DQt5Gui_DIR=${qt5.qtbase.dev}/lib/cmake/Qt5Gui"
+    "-DQt5Core_DIR=${qt5.qtbase.dev}/lib/cmake/Qt5Core"
     "-DBUILD_TYPE=Release"
   ];