diff --git a/src/ObjCRuntime/Runtime.cs b/src/ObjCRuntime/Runtime.cs
index 7fd1d573a5e7..bd8ab8f90795 100644
--- a/src/ObjCRuntime/Runtime.cs
+++ b/src/ObjCRuntime/Runtime.cs
@@ -1946,6 +1946,8 @@ internal static bool StringEquals (IntPtr utf8, string? str)
 					}
 					if (b != (short) str [i])
 						return false;
+					if (b == 0)
+						return false;
 				}
 				return c [str.Length] == 0;
 			}