diff --git a/docker/Dockerfile b/docker/Dockerfile
index e883afd..a785bed 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -42,4 +42,4 @@ RUN if [ "$with_models" = "true" ]; then  \
   fi
 
 EXPOSE 5000
-ENTRYPOINT [ "./venv/bin/libretranslate", "--host", "0.0.0.0" ]
+ENTRYPOINT [ "./venv/bin/libretranslate", "--host", "*" ]
diff --git a/docker/arm.Dockerfile b/docker/arm.Dockerfile
index f60c8ad..8a6831e 100644
--- a/docker/arm.Dockerfile
+++ b/docker/arm.Dockerfile
@@ -40,4 +40,4 @@ RUN if [ "$with_models" = "true" ]; then  \
   fi
 
 EXPOSE 5000
-ENTRYPOINT [ "./venv/bin/libretranslate", "--host", "0.0.0.0" ]
+ENTRYPOINT [ "./venv/bin/libretranslate", "--host", "*" ]
diff --git a/docker/cuda.Dockerfile b/docker/cuda.Dockerfile
index 1b29547..a9d44ae 100644
--- a/docker/cuda.Dockerfile
+++ b/docker/cuda.Dockerfile
@@ -42,4 +42,4 @@ RUN pip3 install Babel==2.12.1 && python3 scripts/compile_locales.py \
 # ENV LD_LIBRARY_PATH=/usr/local/cuda/lib:/usr/local/cuda/lib64
 
 EXPOSE 5000
-ENTRYPOINT [ "libretranslate", "--host", "0.0.0.0" ]
+ENTRYPOINT [ "libretranslate", "--host", "*" ]
diff --git a/libretranslate/main.py b/libretranslate/main.py
index 8337c70..6866a55 100644
--- a/libretranslate/main.py
+++ b/libretranslate/main.py
@@ -215,6 +215,10 @@ def main():
     if '--wsgi' in sys.argv:
         return app
     else:
+        if args.debug and args.host == "*":
+            # '::' will listen on both ipv6 and ipv4
+            args.host = "::"
+
         if args.debug:
             app.run(host=args.host, port=args.port)
         else:
diff --git a/scripts/healthcheck.py b/scripts/healthcheck.py
index 07bcaa4..2f0d22f 100644
--- a/scripts/healthcheck.py
+++ b/scripts/healthcheck.py
@@ -1,7 +1,7 @@
 import requests
 
 response = requests.post(
-    url='http://0.0.0.0:5000/translate',
+    url='http://localhost:5000/translate',
     headers={'Content-Type': 'application/json'},
     json={
          'q': 'Hello World!',