diff --git a/core/Dockerfile.dev b/core/Dockerfile.dev
index 792b373..9c58bf3 100644
--- a/core/Dockerfile.dev
+++ b/core/Dockerfile.dev
@@ -15,8 +15,9 @@ ARG MM3_HK_REF
 RUN --mount=type=cache,target=/root/.cache \
     apk update \
 	&& apk add --no-cache --virtual build-deps gcc python3-dev musl-dev \
-   	    postgresql-dev git libffi-dev  \
-    && apk add --no-cache bash su-exec postgresql-client mysql-client curl python3 py3-pip linux-headers py-cryptography mariadb-connector-c \
+   	    postgresql-dev git libffi-dev g++ \
+    && apk add --no-cache bash su-exec postgresql-client mysql-client \
+        curl python3 py3-pip linux-headers py-cryptography mariadb-connector-c \
     && python3 -m pip install -U psycopg2 pymysql setuptools wheel \
     && python3 -m pip install \
         git+https://gitlab.com/mailman/mailman \
diff --git a/docker-compose.yaml b/docker-compose.yaml
index ecc7ec9..edb0290 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -13,7 +13,7 @@ services:
     depends_on:
     - database
     environment:
-    - DATABASE_URL=postgres://mailman:mailmanpass@database/mailmandb
+    - DATABASE_URL=postgresql://mailman:mailmanpass@database/mailmandb
     - DATABASE_TYPE=postgres
     - DATABASE_CLASS=mailman.database.postgresql.PostgreSQLDatabase
     - HYPERKITTY_API_KEY=someapikey
@@ -36,7 +36,7 @@ services:
     - /opt/mailman/web:/opt/mailman-web-data
     environment:
     - DATABASE_TYPE=postgres
-    - DATABASE_URL=postgres://mailman:mailmanpass@database/mailmandb
+    - DATABASE_URL=postgresql://mailman:mailmanpass@database/mailmandb
     - HYPERKITTY_API_KEY=someapikey
     ports:
     - "127.0.0.1:8000:8000" # HTTP