diff --git a/gcc/config/arm/neon.md b/gcc/config/arm/neon.md
index 6a6573317cf..27dd672ca76 100644
--- a/gcc/config/arm/neon.md
+++ b/gcc/config/arm/neon.md
@@ -459,10 +459,12 @@
 )
 
 (define_expand "vec_init<mode><V_elem_l>"
-  [(match_operand:VDQ 0 "s_register_operand")
+  [(match_operand:VDQX 0 "s_register_operand")
    (match_operand 1 "" "")]
   "TARGET_NEON || TARGET_HAVE_MVE"
 {
+  if (TARGET_HAVE_MVE && GET_MODE_SIZE (GET_MODE (operands[0])) != 16)
+    FAIL;
   neon_expand_vector_init (operands[0], operands[1]);
   DONE;
 })