diff --git a/src/bounce/collision/shapes/qhull.cpp b/src/bounce/collision/shapes/qhull.cpp
index 8bdb151..3b36aa2 100644
--- a/src/bounce/collision/shapes/qhull.cpp
+++ b/src/bounce/collision/shapes/qhull.cpp
@@ -63,7 +63,7 @@ struct b3PIMap
 //
 static b3Vec3 b3ComputeCentroid(b3QHull* hull)
 {
-	B3_ASSERT(hull->vertexCount >= 3);
+	B3_ASSERT(hull->vertexCount >= 4);
 
 	// volume = int(dV)
 	float32 volume = 0.0f;
diff --git a/src/bounce/dynamics/shapes/hull_shape.cpp b/src/bounce/dynamics/shapes/hull_shape.cpp
index 3c70c49..cb43a13 100644
--- a/src/bounce/dynamics/shapes/hull_shape.cpp
+++ b/src/bounce/dynamics/shapes/hull_shape.cpp
@@ -112,7 +112,7 @@ void b3HullShape::ComputeMass(b3MassData* massData, float32 density) const
 	// Here, it was used the great SymPy.
 	// SymPy was available at http://live.sympy.org/
 
-	B3_ASSERT(m_hull->vertexCount >= 3);
+	B3_ASSERT(m_hull->vertexCount >= 4);
 
 	// Put the hull relative to a point that is inside the hull 
 	// to help reducing round-off errors.