diff --git a/src/nvtt/squish/fastclusterfit.h b/src/nvtt/squish/fastclusterfit.h
index cf36eb9..01155cd 100644
--- a/src/nvtt/squish/fastclusterfit.h
+++ b/src/nvtt/squish/fastclusterfit.h
@@ -53,14 +53,14 @@ private:
 	Vec3 m_principle;
 
 #if SQUISH_USE_SIMD
-	Vec4 m_unweighted[16];
+	Vec4 m_unweighted[17];
 	Vec4 m_metric;
 	Vec4 m_metricSqr;
 	Vec4 m_xxsum;
 	Vec4 m_xsum;
 	Vec4 m_besterror;
 #else
-	Vec3 m_unweighted[16];
+	Vec3 m_unweighted[17];
 	Vec3 m_metric;
 	Vec3 m_metricSqr;
 	Vec3 m_xxsum;