diff --git a/tools/cooja/java/org/contikios/cooja/SafeRandom.java b/tools/cooja/java/org/contikios/cooja/SafeRandom.java
index 5dee9c1be..7c428c8cb 100644
--- a/tools/cooja/java/org/contikios/cooja/SafeRandom.java
+++ b/tools/cooja/java/org/contikios/cooja/SafeRandom.java
@@ -36,9 +36,9 @@ import java.util.Random;
  * This ensures that the functions of the random number generator are
  * only called by the the thread initializing a simulation or the
  * simulation thread itself.
- * Rationale: By allowing another thread to use the random number 
- * generator concurrency is intruduced, thus it can not be guaranteed 
- * that simulations are reproduceable.
+ * Rationale: By allowing another thread to use the random number
+ * generator concurrency is introduced, thus it can not be guaranteed
+ * that simulations are reproducible.
  *
  */
 public class SafeRandom extends Random {