diff --git a/pkgs/applications/kde/calendarsupport.nix b/pkgs/applications/kde/calendarsupport.nix
index 1537bd25d55e..0364291994f9 100644
--- a/pkgs/applications/kde/calendarsupport.nix
+++ b/pkgs/applications/kde/calendarsupport.nix
@@ -1,5 +1,5 @@
 {
-  mkDerivation, lib, kdepimTeam,
+  mkDerivation, lib, kdepimTeam, fetchpatch,
   extra-cmake-modules, kdoctools,
   akonadi, akonadi-calendar, akonadi-mime, akonadi-notes, kcalutils, kdepim-apps-libs,
   kholidays, kidentitymanagement, kmime, pimcommon, qttools,
@@ -11,6 +11,13 @@ mkDerivation {
     license = with lib.licenses; [ gpl2 lgpl21 fdl12 ];
     maintainers = kdepimTeam;
   };
+  patches = [
+    # Patch for Qt 5.15.2 until version 20.12.0
+    (fetchpatch {
+      url = "https://invent.kde.org/pim/calendarsupport/-/commit/b4193facb223bd5b73a65318dec8ced51b66adf7.patch";
+      sha256 = "sha256:1da11rqbxxrl06ld3avc41p064arz4n6w5nxq8r008v8ws3s64dy";
+    })
+  ];
   nativeBuildInputs = [ extra-cmake-modules kdoctools ];
   buildInputs = [
     akonadi akonadi-mime akonadi-notes kcalutils kdepim-apps-libs kholidays pimcommon qttools