diff --git a/cabal.project b/cabal.project
index b42793254..1638c009d 100644
--- a/cabal.project
+++ b/cabal.project
@@ -23,6 +23,7 @@ source-repository-package
     type: git
     location: https://github.com/parsonsmatt/mysql
     tag: 1e7dc274bf9a2919c9dd4298ed46c1bd1a1b677d
+    --sha256: 1zbwly28rpwkqqkj9cbsbr57rx2y79nbfcrvqmp7a0gxy0d9i4qy
 
 -- Needed to test that `persistent-redis` works with mtl-2.3
 -- https://github.com/informatikr/hedis/pull/190
diff --git a/flake.nix b/flake.nix
index 35689ff58..aff85c381 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,7 +8,6 @@
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-
   outputs = { self, nixpkgs, flake-utils, haskellNix }:
     flake-utils.lib.eachDefaultSystem (system:
       let
@@ -32,7 +31,13 @@
                   ghcid = "latest";
                   haskell-language-server = "latest";
                 };
-                buildInputs = with pkgs; [ mariadb postgresql redis sqlite ];
+                buildInputs = with pkgs; [
+                  mariadb
+                  mariadb-connector-c.dev
+                  postgresql
+                  redis
+                  sqlite
+                ];
               };
               modules = [{
                 packages."mysql".components.library = with pkgs; {