diff --git a/maven-core/src/main/java/org/apache/maven/lifecycle/internal/BuildThreadFactory.java b/maven-core/src/main/java/org/apache/maven/lifecycle/internal/BuildThreadFactory.java
index 01545078e4..bf6e637f73 100644
--- a/maven-core/src/main/java/org/apache/maven/lifecycle/internal/BuildThreadFactory.java
+++ b/maven-core/src/main/java/org/apache/maven/lifecycle/internal/BuildThreadFactory.java
@@ -34,6 +34,6 @@ public class BuildThreadFactory
 
     public Thread newThread( Runnable r )
     {
-        return new Thread( r, String.format( "%s %d", PREFIX, id.getAndIncrement() ) );
+        return new Thread( r, String.format( "%s-%d", PREFIX, id.getAndIncrement() ) );
     }
-}
\ No newline at end of file
+}