diff --git a/pkgs/development/libraries/qt-6/modules/qttools.nix b/pkgs/development/libraries/qt-6/modules/qttools.nix
index e913cee041f4..bce5841521f9 100644
--- a/pkgs/development/libraries/qt-6/modules/qttools.nix
+++ b/pkgs/development/libraries/qt-6/modules/qttools.nix
@@ -15,7 +15,7 @@ qtModule {
     ../patches/qttools-paths.patch
   ];
   env.NIX_CFLAGS_COMPILE = toString [
-    "-DNIX_OUTPUT_DEV=\"${placeholder "dev"}\""
+    "-DNIX_OUTPUT_OUT=\"${placeholder "out"}\""
   ];
 
   devTools = [
diff --git a/pkgs/development/libraries/qt-6/patches/qttools-paths.patch b/pkgs/development/libraries/qt-6/patches/qttools-paths.patch
index 9a0acb70b0f4..6e7b8488fa54 100644
--- a/pkgs/development/libraries/qt-6/patches/qttools-paths.patch
+++ b/pkgs/development/libraries/qt-6/patches/qttools-paths.patch
@@ -10,9 +10,9 @@ index d355b9dc..94fef33f 100644
 +{
 +  switch (location) {
 +    case QLibraryInfo::BinariesPath:
-+      return QLatin1String(NIX_OUTPUT_DEV) + QLatin1String("/bin");
++      return QLatin1String(NIX_OUTPUT_OUT) + QLatin1String("/bin");
 +    case QLibraryInfo::LibraryExecutablesPath:
-+      return QLatin1String(NIX_OUTPUT_DEV) + QLatin1String("/libexec");
++      return QLatin1String(NIX_OUTPUT_OUT) + QLatin1String("/libexec");
 +    default:
 +      return QLibraryInfo::path(location);
 +  }