diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index 30f4714..b4a7db2 100644
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -1152,7 +1152,8 @@
 	{
 		if(Ice::isVectorType(T(Ty)))
 		{
-			int64_t c[4] = {0, 0, 0, 0};
+			assert(Ice::typeNumElements(T(Ty)) <= 16);
+			int64_t c[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 			return createConstantVector(c, Ty);
 		}
 		else