diff --git a/convert.go b/convert.go
index c37d2b1..58d0f17 100644
--- a/convert.go
+++ b/convert.go
@@ -103,7 +103,7 @@ func Convert(stl STL, outFile string) {
 				ByteOffset:    0,
 				ComponentType: 5126,
 				Type:          "VEC3",
-				Count:         int(stl.TriangleNum),
+				Count:         stl.TriangleNum * 3,
 				Max:           []float32{1, 1, 1},
 				Min:           []float32{-1, -1, -1},
 			},