diff --git a/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache b/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache
index 8c0880bf217..5f68f794e68 100644
--- a/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache
+++ b/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache
@@ -724,8 +724,9 @@ public class ApiClient {
       // Get filename from the Content-Disposition header.
       Pattern pattern = Pattern.compile("filename=['\"]?([^'\"\\s]+)['\"]?");
       Matcher matcher = pattern.matcher(contentDisposition);
-      if (matcher.find())
-        filename = matcher.group(1);
+      if (matcher.find()) {
+        filename = matcher.group(1).replaceAll(".*[/\\\\]", "");
+      }
     }
 
     String prefix = null;
diff --git a/samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/ApiClient.java b/samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/ApiClient.java
index 7fb4cc49bf3..3c9d18d5fc7 100644
--- a/samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/ApiClient.java
+++ b/samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/ApiClient.java
@@ -141,8 +141,8 @@ public class ApiClient {
 
     // Setup authentications (key: authentication name, value: authentication).
     authentications = new HashMap<String, Authentication>();
-    authentications.put("api_key", new ApiKeyAuth("header", "api_key"));
     authentications.put("petstore_auth", new OAuth());
+    authentications.put("api_key", new ApiKeyAuth("header", "api_key"));
     // Prevent the authentications from being modified.
     authentications = Collections.unmodifiableMap(authentications);
   }
@@ -723,8 +723,9 @@ public class ApiClient {
       // Get filename from the Content-Disposition header.
       Pattern pattern = Pattern.compile("filename=['\"]?([^'\"\\s]+)['\"]?");
       Matcher matcher = pattern.matcher(contentDisposition);
-      if (matcher.find())
-        filename = matcher.group(1);
+      if (matcher.find()) {
+        filename = matcher.group(1).replaceAll(".*[/\\\\]", "");
+      }
     }
 
     String prefix = null;