diff --git a/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java b/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java
index 73afca1d..018523c9 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java
@@ -173,8 +173,12 @@ public class UserSettingsActivity extends Activity {
     {
         boolean validate = true;
 
-        if (txtUserName.getText().toString().length() == 0) {
-            txtUserName.setError(getResources().getString(R.string.error_user_name_required));
+        if (txtUserName.getText().toString().length() < 3) {
+            if (txtUserName.getText().toString().length() == 0) {
+                txtUserName.setError(getResources().getString(R.string.error_user_name_required));
+            } else {
+                txtUserName.setError(getResources().getString(R.string.error_user_name_too_short));
+            }
             validate = false;
         }
 
diff --git a/android_app/app/src/main/res/values-de/strings.xml b/android_app/app/src/main/res/values-de/strings.xml
index b43b8e1e..de2ee030 100644
--- a/android_app/app/src/main/res/values-de/strings.xml
+++ b/android_app/app/src/main/res/values-de/strings.xml
@@ -170,4 +170,5 @@
     <string name="label_feedback_message_positive">Ja klar</string>
     <string name="label_feedback_message_negative">Nein danke</string>
     <string name="label_feedback_message_issue">Würdest Du uns etwas Feedback geben?</string>
+    <string name="error_user_name_too_short">Fehler Benutzername muss mind. 3 Zeichen haben</string>
 </resources>
\ No newline at end of file
diff --git a/android_app/app/src/main/res/values/strings.xml b/android_app/app/src/main/res/values/strings.xml
index 1e60b821..4b019798 100644
--- a/android_app/app/src/main/res/values/strings.xml
+++ b/android_app/app/src/main/res/values/strings.xml
@@ -82,6 +82,7 @@
     <string name="error_exporting">Error exporting</string>
     <string name="error_importing">Error importing</string>
     <string name="error_user_name_required">Error: user name is required</string>
+    <string name="error_user_name_too_short">Error: user name have to be at least 3 characters</string>
     <string name="error_body_height_required">Error: body height is required</string>
     <string name="error_initial_weight_required">Error: initial weight is required</string>
     <string name="error_goal_weight_required">Error: goal weight is required</string>