diff --git a/proxy/README.md b/proxy/README.md
index c9540d5e9..683b70900 100644
--- a/proxy/README.md
+++ b/proxy/README.md
@@ -6,7 +6,7 @@ map different paths to different apps (containers).
 
 `nginx.montagu.conf` contains references to an X509 certificate and a private
 key, which it expects at `/etc/montagu/proxy/certificate.pem` and
-`/etc/montagu/proxy/ssl_key.pem`, respectively. The `/etc/montagu/proxy`
+`/etc/montagu/proxy/key.pem`, respectively. The `/etc/montagu/proxy`
 directory can be mounted from a volume providing these certificates, or they
 can be injected into the container using `docker copy`.
 
diff --git a/proxy/entrypoint.sh b/proxy/entrypoint.sh
index 1dc0b5c3c..c2727b22c 100755
--- a/proxy/entrypoint.sh
+++ b/proxy/entrypoint.sh
@@ -24,7 +24,7 @@ if [[ ! -f $root/certificate.pem ]]; then
   openssl req -quiet -x509 -newkey rsa:2048 \
     -sha256 -days 365 -noenc \
     -subj "/C=GB/L=Location/O=Vaccine Impact Modelling Consortium/OU=Montagu/CN=$host" \
-    -keyout "$root/ssl_key.pem" -out "$root/certificate.pem"
+    -keyout "$root/key.pem" -out "$root/certificate.pem"
 fi
 
 echo "Starting nginx"
diff --git a/proxy/nginx.montagu.conf b/proxy/nginx.montagu.conf
index 0c71751af..d4959021a 100644
--- a/proxy/nginx.montagu.conf
+++ b/proxy/nginx.montagu.conf
@@ -55,7 +55,7 @@ server {
     add_header Permissions-Policy "accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=(), interest-cohort=()" always;
 
     ssl_certificate      /etc/montagu/proxy/certificate.pem;
-    ssl_certificate_key  /etc/montagu/proxy/ssl_key.pem;
+    ssl_certificate_key  /etc/montagu/proxy/key.pem;
 
     # SSL settings as recommended by https://ssl-config.mozilla.org
     ssl_protocols TLSv1.2 TLSv1.3;