diff --git a/source/blender/blenkernel/intern/collision.c b/source/blender/blenkernel/intern/collision.c
index ddb01875767..32e9dd7508b 100644
--- a/source/blender/blenkernel/intern/collision.c
+++ b/source/blender/blenkernel/intern/collision.c
@@ -332,7 +332,7 @@ static int cloth_collision_response_static ( ClothModifierData *clmd, CollisionM
 			// DG: this formula ineeds to be changed for this code since we apply impulses/repulses like this:
 			// v += impulse; x_new = x + v; 
 			// We don't use dt!!
-			/* float spf = (float)clmd->sim_parms->stepsPerFrame / clmd->sim_parms->timescale; */ /* XXX UNUSED */
+			float spf = (float)clmd->sim_parms->stepsPerFrame / clmd->sim_parms->timescale;
 
 			float d = clmd->coll_parms->epsilon*8.0f/9.0f + epsilon2*8.0f/9.0f - collpair->distance;
 			if ( d > ALMOST_ZERO) {