diff --git a/pkgs/development/libraries/qt-5/5.4/qtserialport/default.nix b/pkgs/development/libraries/qt-5/5.4/qtserialport/default.nix
index 072825dfe9ba..2c9575f122e7 100644
--- a/pkgs/development/libraries/qt-5/5.4/qtserialport/default.nix
+++ b/pkgs/development/libraries/qt-5/5.4/qtserialport/default.nix
@@ -10,4 +10,7 @@ qtSubmodule {
       libudev = libudev.out;
     })
   ];
+  postFixup = ''
+    fixQtModuleCMakeConfig "SerialPort"
+  '';
 }