diff --git a/pkgs/development/libraries/qt-5/5.9/default.nix b/pkgs/development/libraries/qt-5/5.9/default.nix
index fd4769a02c6a..7aba54fb883b 100644
--- a/pkgs/development/libraries/qt-5/5.9/default.nix
+++ b/pkgs/development/libraries/qt-5/5.9/default.nix
@@ -31,7 +31,7 @@ with stdenv.lib;
 
 let
 
-  qtCompatVersion = "5.8";
+  qtCompatVersion = "5.9";
 
   mirror = "http://download.qt.io";
   srcs = import ./srcs.nix { inherit fetchurl; inherit mirror; };