diff --git a/src/box2d.mk b/src/box2d.mk
index e0402a29..9d51d912 100644
--- a/src/box2d.mk
+++ b/src/box2d.mk
@@ -5,7 +5,7 @@ PKG             := box2d
 $(PKG)_IGNORE   :=
 $(PKG)_VERSION  := 2.3.1
 $(PKG)_CHECKSUM := 2c61505f03ef403b54cf0e510d83d6f567e37882ad79b5b2d486acbc7d5eedea
-$(PKG)_SUBDIR   := $(PKG)-$($(PKG)_VERSION)/Box2D
+$(PKG)_SUBDIR   := Box2D-$($(PKG)_VERSION)/Box2D
 $(PKG)_FILE     := $(PKG)-$($(PKG)_VERSION).tar.gz
 $(PKG)_URL      := https://github.com/erincatto/Box2D/archive/v$($(PKG)_VERSION).tar.gz
 $(PKG)_DEPS     := gcc