diff --git a/src/coreclr/nativeaot/System.Private.CoreLib/src/System/InvokeUtils.cs b/src/coreclr/nativeaot/System.Private.CoreLib/src/System/InvokeUtils.cs
index 1d4007ac93a68a..88013f0ad58b0b 100644
--- a/src/coreclr/nativeaot/System.Private.CoreLib/src/System/InvokeUtils.cs
+++ b/src/coreclr/nativeaot/System.Private.CoreLib/src/System/InvokeUtils.cs
@@ -191,16 +191,26 @@ private static Exception ConvertOrWidenPrimitivesEnumsAndPointersIfPossible(obje
                     break;
 
                 case EETypeElementType.SByte:
-
-                    // Can only be sbyte here
-                    sbyteValue = RuntimeHelpers.FastUnbox<sbyte>(srcObject);
+                    switch (srcElementType)
+                    {
+                        case EETypeElementType.SByte:
+                            sbyteValue = RuntimeHelpers.FastUnbox<sbyte>(srcObject);
+                            break;
+                        default:
+                            goto Failure;
+                    }
                     rawDstValue = &sbyteValue;
                     break;
 
                 case EETypeElementType.Byte:
-
-                    // Can only be byte here
-                    byteValue = RuntimeHelpers.FastUnbox<byte>(srcObject);
+                    switch (srcElementType)
+                    {
+                        case EETypeElementType.Byte:
+                            byteValue = RuntimeHelpers.FastUnbox<byte>(srcObject);
+                            break;
+                        default:
+                            goto Failure;
+                    }
                     rawDstValue = &byteValue;
                     break;