diff --git a/pkgs/development/python-modules/blockdiag/default.nix b/pkgs/development/python-modules/blockdiag/default.nix
index ce100622b585..b2d341b67c1e 100644
--- a/pkgs/development/python-modules/blockdiag/default.nix
+++ b/pkgs/development/python-modules/blockdiag/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , docutils
 , fetchFromGitHub
+, fetchpatch
 , funcparserlib
 , nose
 , pillow
@@ -28,6 +29,15 @@ buildPythonPackage rec {
     hash = "sha256-j8FoNUIJJOaahaol1MRPyY2jcPCEIlaAD4bmM2QKFFI=";
   };
 
+  patches = [
+    # https://github.com/blockdiag/blockdiag/pull/179
+    (fetchpatch {
+      name = "pillow-10-compatibility.patch";
+      url = "https://github.com/blockdiag/blockdiag/commit/20d780cad84e7b010066cb55f848477957870165.patch";
+      hash = "sha256-t1zWFzAsLL2EUa0nD4Eui4Y5AhAZLRmp/yC9QpzzeUA=";
+    })
+  ];
+
   propagatedBuildInputs = [
     setuptools
     funcparserlib