diff --git a/arduino-core/src/processing/app/SketchCode.java b/arduino-core/src/processing/app/SketchCode.java
index 88d2a5196..28d838a52 100644
--- a/arduino-core/src/processing/app/SketchCode.java
+++ b/arduino-core/src/processing/app/SketchCode.java
@@ -198,10 +198,10 @@ public class SketchCode {
     if (program.indexOf('\uFFFD') != -1) {
       System.err.println(
         I18n.format(
-          tr("\"{0}\" contains unrecognized characters." +
-            "If this code was created with an older version of Arduino," +
-            "you may need to use Tools -> Fix Encoding & Reload to update" +
-            "the sketch to use UTF-8 encoding. If not, you may need to" +
+          tr("\"{0}\" contains unrecognized characters. " +
+            "If this code was created with an older version of Arduino, " +
+            "you may need to use Tools -> Fix Encoding & Reload to update " +
+            "the sketch to use UTF-8 encoding. If not, you may need to " +
             "delete the bad characters to get rid of this warning."),
           file.getName()
         )