diff --git a/pkgs/development/libraries/qt-5/5.5/qtserialport/default.nix b/pkgs/development/libraries/qt-5/5.5/qtserialport/default.nix
index 32549c95344..3f409f9c0e0 100644
--- a/pkgs/development/libraries/qt-5/5.5/qtserialport/default.nix
+++ b/pkgs/development/libraries/qt-5/5.5/qtserialport/default.nix
@@ -9,4 +9,7 @@ qtSubmodule {
       libudev = libudev.out;
     })
   ];
+  postFixup = ''
+    fixQtModuleCMakeConfig "SerialPort"
+  '';
 }