diff --git a/check-endpoint.py b/check-endpoint.py
index 2d2b827..c1dd622 100755
--- a/check-endpoint.py
+++ b/check-endpoint.py
@@ -1973,7 +1973,7 @@ def serve_prometheus(bind, port, url, probe_fn):
 
 def main():
     parser = argparse.ArgumentParser(
-        prog="check-endpoint.py",
+        prog=os.path.basename(sys.argv[0]),
         formatter_class=argparse.RawDescriptionHelpFormatter,
         description=(
             "check-endpoint.py: live per-phase HTTP timing probe, curl-style.\n\n"
diff --git a/contrib/check-endpoint-cli/Dockerfile b/contrib/check-endpoint-cli/Dockerfile
index 30762af..95bc0ac 100644
--- a/contrib/check-endpoint-cli/Dockerfile
+++ b/contrib/check-endpoint-cli/Dockerfile
@@ -73,8 +73,10 @@ RUN pip install --no-cache-dir --no-index --find-links=/wheels \
 # Installed on PATH under its own name so an interactive session can type
 # `check-endpoint https://...` exactly as you would on a laptop, rather than
 # `python /app/check-endpoint.py`.
-COPY check-endpoint.py /usr/local/bin/check-endpoint
-RUN chmod 0755 /usr/local/bin/check-endpoint
+WORKDIR /usr/local/bin
+COPY check-endpoint.py /usr/local/bin/check-endpoint.py
+RUN chmod 0755 /usr/local/bin/check-endpoint.py \
+    && ln -s check-endpoint.py /usr/local/bin/check-endpoint
 
 # Colour is auto-disabled when stdout is not a TTY, so this only has an effect
 # under `docker run -it` or `kubectl exec -it`. Piping still gives clean text.
diff --git a/contrib/check-endpoint-cli/check-endpoint.py b/contrib/check-endpoint-cli/check-endpoint.py
index 2d2b827..c1dd622 100755
--- a/contrib/check-endpoint-cli/check-endpoint.py
+++ b/contrib/check-endpoint-cli/check-endpoint.py
@@ -1973,7 +1973,7 @@ def serve_prometheus(bind, port, url, probe_fn):
 
 def main():
     parser = argparse.ArgumentParser(
-        prog="check-endpoint.py",
+        prog=os.path.basename(sys.argv[0]),
         formatter_class=argparse.RawDescriptionHelpFormatter,
         description=(
             "check-endpoint.py: live per-phase HTTP timing probe, curl-style.\n\n"
diff --git a/contrib/check-endpoint-exporter/Dockerfile b/contrib/check-endpoint-exporter/Dockerfile
index cdc4e1e..8f1d432 100644
--- a/contrib/check-endpoint-exporter/Dockerfile
+++ b/contrib/check-endpoint-exporter/Dockerfile
@@ -39,6 +39,8 @@ RUN pip install --no-cache-dir --no-index --find-links=/wheels pycurl \
 
 WORKDIR /app
 COPY check-endpoint.py /app/check-endpoint.py
+RUN chmod 0755 /app/check-endpoint.py \
+    && ln -s check-endpoint.py /app/check-endpoint
 
 # Run as an unprivileged user.
 RUN useradd --system --uid 10001 --no-create-home exporter
diff --git a/contrib/check-endpoint-exporter/check-endpoint.py b/contrib/check-endpoint-exporter/check-endpoint.py
index 2d2b827..c1dd622 100755
--- a/contrib/check-endpoint-exporter/check-endpoint.py
+++ b/contrib/check-endpoint-exporter/check-endpoint.py
@@ -1973,7 +1973,7 @@ def serve_prometheus(bind, port, url, probe_fn):
 
 def main():
     parser = argparse.ArgumentParser(
-        prog="check-endpoint.py",
+        prog=os.path.basename(sys.argv[0]),
         formatter_class=argparse.RawDescriptionHelpFormatter,
         description=(
             "check-endpoint.py: live per-phase HTTP timing probe, curl-style.\n\n"