diff --git a/app/test/processing/app/helpers/StringUtilsTest.java b/app/test/processing/app/helpers/StringUtilsTest.java
index 1ddbf51b3..9cc595542 100644
--- a/app/test/processing/app/helpers/StringUtilsTest.java
+++ b/app/test/processing/app/helpers/StringUtilsTest.java
@@ -29,6 +29,7 @@
 
 package processing.app.helpers;
 
+import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
diff --git a/arduino-core/src/cc/arduino/packages/discoverers/PluggableDiscovery.java b/arduino-core/src/cc/arduino/packages/discoverers/PluggableDiscovery.java
index d37166699..3f7202fa6 100644
--- a/arduino-core/src/cc/arduino/packages/discoverers/PluggableDiscovery.java
+++ b/arduino-core/src/cc/arduino/packages/discoverers/PluggableDiscovery.java
@@ -36,6 +36,8 @@ import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.apache.commons.lang3.StringUtils;
+
 import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
 import com.fasterxml.jackson.annotation.PropertyAccessor;
 import com.fasterxml.jackson.core.JsonFactory;
@@ -48,7 +50,6 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import cc.arduino.packages.BoardPort;
 import cc.arduino.packages.Discovery;
 import processing.app.PreferencesData;
-import processing.app.helpers.StringUtils;
 
 public class PluggableDiscovery implements Discovery {
 
diff --git a/arduino-core/src/cc/arduino/packages/uploaders/SSHUploader.java b/arduino-core/src/cc/arduino/packages/uploaders/SSHUploader.java
index 5b4896313..fb0eb3ffb 100644
--- a/arduino-core/src/cc/arduino/packages/uploaders/SSHUploader.java
+++ b/arduino-core/src/cc/arduino/packages/uploaders/SSHUploader.java
@@ -44,7 +44,6 @@ import processing.app.debug.TargetPlatform;
 import processing.app.helpers.PreferencesMap;
 import processing.app.helpers.PreferencesMapException;
 import processing.app.helpers.StringReplacer;
-import processing.app.helpers.StringUtils;
 
 import java.io.File;
 import java.io.IOException;
@@ -54,6 +53,8 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
+import org.apache.commons.lang3.StringUtils;
+
 import static processing.app.I18n.tr;
 
 public class SSHUploader extends Uploader {
diff --git a/arduino-core/src/processing/app/helpers/StringUtils.java b/arduino-core/src/processing/app/helpers/StringUtils.java
index f20461c63..0e5b883ed 100644
--- a/arduino-core/src/processing/app/helpers/StringUtils.java
+++ b/arduino-core/src/processing/app/helpers/StringUtils.java
@@ -15,12 +15,4 @@ public class StringUtils {
     }
     return s.substring(0, i + 1);
   }
-
-  public static String join(String[] arr, String separator) {
-    StringBuffer sb = new StringBuffer();
-    for (String s : arr) {
-      sb.append(s).append(separator);
-    }
-    return sb.substring(0, sb.length() - separator.length());
-  }
 }