diff --git a/source/blender/blenlib/intern/math_geom_inline.c b/source/blender/blenlib/intern/math_geom_inline.c
index 4b1d6a94185..0e243c5e198 100644
--- a/source/blender/blenlib/intern/math_geom_inline.c
+++ b/source/blender/blenlib/intern/math_geom_inline.c
@@ -218,7 +218,7 @@ MINLINE int min_axis_v3(const float vec[3])
  */
 MINLINE int poly_to_tri_count(const int poly_count, const int corner_count)
 {
-	BLI_assert(corner_count > poly_count * 2);
+	BLI_assert(!poly_count || corner_count > poly_count * 2);
 	return corner_count - (poly_count * 2);
 }