diff --git a/src/BulletCollision/ibmsdk/Makefile b/src/BulletCollision/ibmsdk/Makefile
index 72028da0e..ad04ef1d2 100644
--- a/src/BulletCollision/ibmsdk/Makefile
+++ b/src/BulletCollision/ibmsdk/Makefile
@@ -12,6 +12,7 @@ LIBRARY_ppu = bulletcollision.a
 
 #### Compiler flags
 CPPFLAGS        = 		\
+-DUSE_LIBSPE2	\
 -I../BroadphaseCollision		\
 -I../CollisionDispath		\
 -I../NarrowPhaseCollision		\
@@ -38,6 +39,7 @@ btGjkConvexCast.o				\
 btGjkEpa.o					\
 btGjkEpaPenetrationDepthSolver.o		\
 btGjkPairDetector.o				\
+btDefaultCollisionConfiguration.o		\
 btMinkowskiPenetrationDepthSolver.o		\
 btPersistentManifold.o				\
 btRaycastCallback.o				\
diff --git a/src/BulletDynamics/ibmsdk/Makefile b/src/BulletDynamics/ibmsdk/Makefile
index c7e0b8a5a..b599a0fd9 100644
--- a/src/BulletDynamics/ibmsdk/Makefile
+++ b/src/BulletDynamics/ibmsdk/Makefile
@@ -11,6 +11,7 @@ LIBRARY_ppu = bulletdynamics.a
 
 #### Compiler flags
 CPPFLAGS        = 		\
+-DUSE_LIBSPE2			\
 -I../ConstraintSolver		\
 -I../Dynamics			\
 -I../Vehicle			\
diff --git a/src/LinearMath/ibmsdk/Makefile b/src/LinearMath/ibmsdk/Makefile
index 0114f2634..3642abd3a 100644
--- a/src/LinearMath/ibmsdk/Makefile
+++ b/src/LinearMath/ibmsdk/Makefile
@@ -8,6 +8,7 @@ LIBRARY_ppu = bulletmath.a
 
 #### Compiler flags
 CPPFLAGS        = 		\
+-DUSE_LIBSPE2			\
 -I$(ROOT)/src			\
 -I$(SDKINC)