diff --git a/docs/configuration/ssl.md b/docs/configuration/ssl.md
index c24e6cbed..4bf3550cd 100644
--- a/docs/configuration/ssl.md
+++ b/docs/configuration/ssl.md
@@ -143,6 +143,8 @@ Certain versions of nginx have bugs that prevent [HTTP/2](https://nginx.org/en/d
 
 When your app is served from port `80` then the `/home/dokku/APP/nginx.conf` file will automatically be updated to instruct nginx to respond to ssl on port 443 as a new cert is added. If your app uses a non-standard port (perhaps you have a dockerfile deploy exposing port `99999`) you may need to manually expose an ssl port via `dokku ports:add <APP> https:443:99999`.
 
+If an `https:443:*` port mapping already exists when a certificate is installed or renewed, Dokku will preserve it rather than rewriting it from the `http:80:*` mappings. This allows apps that terminate TLS inside the container (for example, with a configuration like `http:80:80 https:443:443`) to keep their explicit mapping across `dokku certs:add` and unattended renewals.
+
 ## Other
 
 ### Running behind a proxy (`X-Forwarded-Ssl`, etc.)
diff --git a/plugins/ports/triggers.go b/plugins/ports/triggers.go
index 8d6ce6cd7..9596ae174 100644
--- a/plugins/ports/triggers.go
+++ b/plugins/ports/triggers.go
@@ -176,6 +176,12 @@ func TriggerPostCertsUpdate(appName string) error {
 		common.PropertyDelete("proxy", appName, "proxy-ssl-port")
 	}
 
+	for _, portMap := range portMaps {
+		if portMap.Scheme == "https" && portMap.HostPort == 443 {
+			return nil
+		}
+	}
+
 	var http80Ports []PortMap
 	for _, portMap := range portMaps {
 		if portMap.Scheme == "http" && portMap.HostPort == 80 {
@@ -186,17 +192,6 @@ func TriggerPostCertsUpdate(appName string) error {
 	http80Ports = uniquePortMaps(http80Ports)
 
 	if len(http80Ports) > 0 {
-		var https443Ports []PortMap
-		for _, portMap := range portMaps {
-			if portMap.Scheme == "https" && portMap.HostPort == 443 {
-				https443Ports = append(https443Ports, portMap)
-			}
-		}
-
-		if err := removePortMaps(appName, https443Ports); err != nil {
-			return err
-		}
-
 		var toAdd []PortMap
 		for _, portMap := range http80Ports {
 			toAdd = append(toAdd, PortMap{
diff --git a/tests/unit/certs.bats b/tests/unit/certs.bats
index d0df07235..d5897ffbb 100644
--- a/tests/unit/certs.bats
+++ b/tests/unit/certs.bats
@@ -87,6 +87,40 @@ teardown() {
   assert_success
 }
 
+@test "(certs:add) preserves explicit https:443 port mapping" {
+  run /bin/bash -c "dokku ports:set $TEST_APP http:80:80 https:443:443"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku certs:add $TEST_APP $BATS_TMPDIR/tls/server.crt $BATS_TMPDIR/tls/server.key"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku --quiet ports:report $TEST_APP --ports-map"
+  echo "output: $output"
+  echo "status: $status"
+  assert_output "http:80:80 https:443:443"
+}
+
+@test "(certs:add) adds default https:443 mapping when none exists" {
+  run /bin/bash -c "dokku ports:set $TEST_APP http:80:5000"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku certs:add $TEST_APP $BATS_TMPDIR/tls/server.crt $BATS_TMPDIR/tls/server.key"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku --quiet ports:report $TEST_APP --ports-map"
+  echo "output: $output"
+  echo "status: $status"
+  assert_output "http:80:5000 https:443:5000"
+}
+
 @test "(certs) certs:add with multiple dots in the filename" {
   run /bin/bash -c "dokku certs:add $TEST_APP $BATS_TMPDIR/tls/domain.com.crt $BATS_TMPDIR/tls/domain.com.key"
   echo "output: $output"