diff --git a/pkgs/applications/audio/ardour/7.nix b/pkgs/applications/audio/ardour/7.nix
index 0466742b6198..d0554a21af18 100644
--- a/pkgs/applications/audio/ardour/7.nix
+++ b/pkgs/applications/audio/ardour/7.nix
@@ -3,6 +3,7 @@
 , fetchgit
 , fetchzip
 , fetchpatch
+, fetchpatch2
 , alsa-lib
 , aubio
 , boost
@@ -86,6 +87,12 @@ stdenv.mkDerivation rec {
       url = "https://github.com/Ardour/ardour/commit/e995daa37529715214c6c4a2587e4134aaaba02f.patch";
       hash = "sha256-EpXOIIObOwwcNgNma0E3nvaBad3930sagDjBpa+78WI=";
     })
+
+    # Work around itstools bug #9648
+    (fetchpatch2 {
+      url = "https://github.com/Ardour/ardour/commit/338cd09a4aa1b36b8095dfc14ab534395f9a4a92.patch?full_index=1";
+      hash = "sha256-AvV4aLdkfrxPkE4NX2ETSagq4GjEC+sHCEqdcYvL+CY=";
+    })
   ];
 
   # Ardour's wscript requires git revision and date to be available.