diff --git a/docker-compose.yaml b/docker-compose.yaml
index b5e8d0c7..557388b7 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -11,6 +11,7 @@ services:
       - MINT_LIGHTNING_BACKEND=FakeWallet
       - MINT_LISTEN_HOST=0.0.0.0
       - MINT_LISTEN_PORT=3338
+      - MINT_PRIVATE_KEY=TEST_PRIVATE_KEY
     command: ["poetry", "run", "mint"]
   wallet:
     build: