diff --git a/gcc/tree-ssa-forwprop.cc b/gcc/tree-ssa-forwprop.cc
index 69567ab3275..be888f1c48e 100644
--- a/gcc/tree-ssa-forwprop.cc
+++ b/gcc/tree-ssa-forwprop.cc
@@ -2414,6 +2414,9 @@ simplify_permutation (gimple_stmt_iterator *gsi)
   if (TREE_CODE (op2) != VECTOR_CST)
     return 0;
 
+  if (!types_compatible_p (TREE_TYPE (gimple_get_lhs (stmt)), TREE_TYPE (op0)))
+    return 0;
+
   if (TREE_CODE (op0) == VECTOR_CST)
     {
       code = VECTOR_CST;