diff --git a/shell.nix b/shell.nix
index c3bb1f7..52dbc8e 100644
--- a/shell.nix
+++ b/shell.nix
@@ -9,4 +9,5 @@ mkShell rec {
   ];
   buildInputs = additionalBuildInputs;
   LD_LIBRARY_PATH = lib.makeLibraryPath buildInputs;
+  DATABASE_URL = "sqlite:testing.db";
 }