diff --git a/pkgs/development/python-modules/aiomysql/default.nix b/pkgs/development/python-modules/aiomysql/default.nix
index 803f642406c..3432931f935 100644
--- a/pkgs/development/python-modules/aiomysql/default.nix
+++ b/pkgs/development/python-modules/aiomysql/default.nix
@@ -4,6 +4,7 @@
 , pymysql
 , pytest
 , isPy27
+, fetchpatch
 }:
 
 buildPythonPackage rec {
@@ -18,6 +19,14 @@ buildPythonPackage rec {
     sha256 = "1qvy3phbsxp55161dnppjfx2m1kn82v0irc3xzqw0adfd81vaiad";
   };
 
+  patches = [
+    (fetchpatch {
+      # vendor functions previously provided by pymysql.util
+      url = "https://github.com/aio-libs/aiomysql/pull/554/commits/919b997a9de7f53d721af76762fba425e306531e.patch";
+      sha256 = "V1VYyqr6RwTXoVoGVyMuJst6uqTuuHbpMOpLoVZO1XA=";
+    })
+  ];
+
   propagatedBuildInputs = [
     pymysql
   ];