diff --git a/src/coreclr/jit/compiler.h b/src/coreclr/jit/compiler.h
index 6b7d47e207241..a8e4f3191b68e 100644
--- a/src/coreclr/jit/compiler.h
+++ b/src/coreclr/jit/compiler.h
@@ -8696,25 +8696,33 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
     uint32_t getMaxVectorByteLength() const
     {
 #if defined(FEATURE_HW_INTRINSICS) && defined(TARGET_XARCH)
-        if (compOpportunisticallyDependsOn(InstructionSet_AVX))
+        if (compOpportunisticallyDependsOn(InstructionSet_AVX512F))
         {
-            if (compOpportunisticallyDependsOn(InstructionSet_AVX512F))
-            {
-                return ZMM_REGSIZE_BYTES;
-            }
-            else
-            {
-                return YMM_REGSIZE_BYTES;
-            }
+            return ZMM_REGSIZE_BYTES;
         }
-        else
+        else if (compOpportunisticallyDependsOn(InstructionSet_AVX))
+        {
+            return YMM_REGSIZE_BYTES;
+        }
+        else if (compOpportunisticallyDependsOn(InstructionSet_SSE))
         {
-            assert(compIsaSupportedDebugOnly(InstructionSet_SSE));
             return XMM_REGSIZE_BYTES;
         }
+        else
+        {
+            assert((JitConfig.EnableHWIntrinsic() == 0) || (JitConfig.EnableSSE() == 0));
+            return 0;
+        }
 #elif defined(TARGET_ARM64)
-        assert(compIsaSupportedDebugOnly(InstructionSet_AdvSimd));
-        return FP_REGSIZE_BYTES;
+        if (compOpportunisticallyDependsOn(InstructionSet_AdvSimd))
+        {
+            return FP_REGSIZE_BYTES;
+        }
+        else
+        {
+            assert((JitConfig.EnableHWIntrinsic() == 0) || (JitConfig.EnableArm64AdvSimd() == 0));
+            return 0;
+        }
 #else
         assert(!"getMaxVectorByteLength() unimplemented on target arch");
         unreached();