diff --git a/Dockerfile b/Dockerfile
index 8419d0d425fe819b22782049aa95c86f7ff66d05..a5bcb9db7f3b4498b359f21a9f73540e8d5a2fda 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,7 +20,7 @@ RUN DATABASE_URL=postgres://x/x \
     OIDC_RP_REALM_URL=x \
     OIDC_RP_CLIENT_ID=x \
     OIDC_RP_CLIENT_SECRET=x \
-    CLAMD_TCP_SOCKET=x \
+    CLAMD_TCP_SOCKET=1 \
     CLAMD_TCP_ADDR=x \
     DEFAULT_COUNTRY=x \
     DEFAULT_CONTRACTEE_NAME=x \