diff --git a/dumper.go b/dumper.go
index 2e5cebe..a55df43 100644
--- a/dumper.go
+++ b/dumper.go
@@ -40,7 +40,7 @@ type Account struct {
 	KeyType      certcrypto.KeyType
 }
 
-func dump(acmeFile, dumpPath string) error {
+func dump(acmeFile, dumpPath string, crtExt, keyExt string) error {
 	f, err := os.Open(acmeFile)
 	if err != nil {
 		return err
@@ -66,18 +66,18 @@ func dump(acmeFile, dumpPath string) error {
 	}
 
 	privateKeyPem := extractPEMPrivateKey(data.Account)
-	err = ioutil.WriteFile(filepath.Join(dumpPath, "private", "letsencrypt.key"), privateKeyPem, 0666)
+	err = ioutil.WriteFile(filepath.Join(dumpPath, "private", "letsencrypt"+keyExt), privateKeyPem, 0666)
 	if err != nil {
 		return err
 	}
 
 	for _, cert := range data.Certificates {
-		err = ioutil.WriteFile(filepath.Join(dumpPath, "private", cert.Domain.Main+".key"), cert.Key, 0666)
+		err = ioutil.WriteFile(filepath.Join(dumpPath, "private", cert.Domain.Main+keyExt), cert.Key, 0666)
 		if err != nil {
 			return err
 		}
 
-		err = ioutil.WriteFile(filepath.Join(dumpPath, "certs", cert.Domain.Main+".crt"), cert.Certificate, 0666)
+		err = ioutil.WriteFile(filepath.Join(dumpPath, "certs", cert.Domain.Main+crtExt), cert.Certificate, 0666)
 		if err != nil {
 			return err
 		}
diff --git a/main.go b/main.go
index 2cbcb04..8b2c755 100644
--- a/main.go
+++ b/main.go
@@ -23,8 +23,10 @@ func main() {
 		Run: func(cmd *cobra.Command, _ []string) {
 			acmeFile := cmd.Flag("source").Value.String()
 			dumpPath := cmd.Flag("dest").Value.String()
+			crtExt := cmd.Flag("crt-ext").Value.String()
+			keyExt := cmd.Flag("key-ext").Value.String()
 
-			err := dump(acmeFile, dumpPath)
+			err := dump(acmeFile, dumpPath, crtExt, keyExt)
 			if err != nil {
 				log.Fatal(err)
 			}
@@ -33,6 +35,8 @@ func main() {
 
 	dumpCmd.Flags().String("source", "./acme.json", "Path to 'acme.json' file.")
 	dumpCmd.Flags().String("dest", "./dump", "Path to store the dump content.")
+	dumpCmd.Flags().String("crt-ext", ".crt", "The file extension of the generated certificates")
+	dumpCmd.Flags().String("key-ext", ".key", "The file extension of the generated privates keys")
 	rootCmd.AddCommand(dumpCmd)
 
 	var versionCmd = &cobra.Command{
diff --git a/readme.md b/readme.md
index 394e51e..aadfd6c 100644
--- a/readme.md
+++ b/readme.md
@@ -29,9 +29,11 @@ Usage:
   traefik-certs-dumper dump [flags]
 
 Flags:
-      --dest string     Path to store the dump content. (default "./dump")
-  -h, --help            help for dump
-      --source string   Path to 'acme.json' file. (default "./acme.json")
+      --crt-ext string   The file extension of the generated certificates (default ".crt")
+      --dest string      Path to store the dump content. (default "./dump")
+  -h, --help             help for dump
+      --key-ext string   The file extension of the generated privates keys (default ".key")
+      --source string    Path to 'acme.json' file. (default "./acme.json")
 ```
 
 ## Examples
@@ -43,3 +45,13 @@ traefik-certs-dumper dump
 ```bash
 traefik-certs-dumper dump --source ./acme.json --dest ./dump
 ```
+
+```bash
+traefik-certs-dumper dump --crt-ext=.pem --key-ext=.pem
+
+```
+
+- https://github.com/containous/traefik/issues/4381
+- https://github.com/containous/traefik/issues/2418
+- https://github.com/containous/traefik/issues/3847
+- https://github.com/SvenDowideit/traefik-certdumper