diff --git a/okhttp/src/test/java/org/baeldung/okhttp/OkHttpFileUploadingTest.java b/okhttp/src/test/java/org/baeldung/okhttp/OkHttpFileUploadingTest.java
index 6c43af6778..32457fc11b 100644
--- a/okhttp/src/test/java/org/baeldung/okhttp/OkHttpFileUploadingTest.java
+++ b/okhttp/src/test/java/org/baeldung/okhttp/OkHttpFileUploadingTest.java
@@ -29,8 +29,8 @@ public class OkHttpFileUploadingTest {
 
         RequestBody requestBody = new MultipartBody.Builder()
           .setType(MultipartBody.FORM)
-          .addFormDataPart("file", "file.ext",
-            RequestBody.create(MediaType.parse("image/png"), new File("src/test/resources/test.in")))
+          .addFormDataPart("file", "file.txt",
+            RequestBody.create(MediaType.parse("application/octet-stream"), new File("src/test/resources/test.txt")))
           .build();
 
         Request request = new Request.Builder()
@@ -51,8 +51,8 @@ public class OkHttpFileUploadingTest {
 
         RequestBody requestBody = new MultipartBody.Builder()
           .setType(MultipartBody.FORM)
-          .addFormDataPart("file", "file.ext",
-            RequestBody.create(MediaType.parse("image/png"), new File("src/test/resources/test.in")))
+          .addFormDataPart("file", "file.txt",
+            RequestBody.create(MediaType.parse("application/octet-stream"), new File("src/test/resources/test.txt")))
           .build();
 
 
diff --git a/okhttp/src/test/java/org/baeldung/okhttp/OkHttpPostingTest.java b/okhttp/src/test/java/org/baeldung/okhttp/OkHttpPostingTest.java
index cdb7f2ac8d..1ba2d517c5 100644
--- a/okhttp/src/test/java/org/baeldung/okhttp/OkHttpPostingTest.java
+++ b/okhttp/src/test/java/org/baeldung/okhttp/OkHttpPostingTest.java
@@ -92,8 +92,8 @@ public class OkHttpPostingTest {
           .setType(MultipartBody.FORM)
           .addFormDataPart("username", "test")
           .addFormDataPart("password", "test")
-          .addFormDataPart("file", "file.ext",
-            RequestBody.create(MediaType.parse("image/png"), new File("src/test/resources/test.in")))
+          .addFormDataPart("file", "file.txt",
+            RequestBody.create(MediaType.parse("application/octet-stream"), new File("src/test/resources/test.txt")))
           .build();
 
         Request request = new Request.Builder()
diff --git a/okhttp/src/test/resources/test.in b/okhttp/src/test/resources/test.txt
similarity index 100%
rename from okhttp/src/test/resources/test.in
rename to okhttp/src/test/resources/test.txt