diff --git a/ports/box2d/CONTROL b/ports/box2d/CONTROL
index 4126c7b89..7cfcb01a0 100644
--- a/ports/box2d/CONTROL
+++ b/ports/box2d/CONTROL
@@ -1,3 +1,3 @@
 Source: box2d
-Version: 374664b
+Version: 2.3.1-374664b
 Description: Box2D (http://box2d.org) is an open source C++ engine for simulating rigid bodies in 2D.