diff --git a/Vec3f.c b/Vec3f.c
index 05faa81..e4a1954 100644
--- a/Vec3f.c
+++ b/Vec3f.c
@@ -132,7 +132,7 @@ void CgeVec3fRefract(const float in[3], const float norm[3], float eta,
     nDotI = CgeVec3fDot(norm, in);
     k = 1.0f - eta * eta * (1.0f - nDotI * nDotI);
     if (k < 0.0f) {
-        out[0] = out[1] = 0.0f;
+        out[0] = out[1] = out[2] = 0.0f;
         return;
     }