diff --git a/source/blender/physics/intern/BPH_mass_spring.cpp b/source/blender/physics/intern/BPH_mass_spring.cpp
index 30a8478e0e4..29f5ed63cac 100644
--- a/source/blender/physics/intern/BPH_mass_spring.cpp
+++ b/source/blender/physics/intern/BPH_mass_spring.cpp
@@ -444,11 +444,11 @@ static void hair_get_boundbox(ClothModifierData *clmd, float gmin[3], float gmax
 {
 	Cloth *cloth = clmd->clothObject;
 	Implicit_Data *data = cloth->implicit;
-	unsigned int looptri_num = cloth->tri_num;
+	unsigned int mvert_num = cloth->mvert_num;
 	int i;
 	
 	INIT_MINMAX(gmin, gmax);
-	for (i = 0; i < looptri_num; i++) {
+	for (i = 0; i < mvert_num; i++) {
 		float x[3];
 		BPH_mass_spring_get_motion_state(data, i, x, NULL);
 		DO_MINMAX(x, gmin, gmax);