diff --git a/src/libraries/System.Runtime/ref/System.Runtime.cs b/src/libraries/System.Runtime/ref/System.Runtime.cs
index ac82e2c50fa3b..12510d4c0b983 100644
--- a/src/libraries/System.Runtime/ref/System.Runtime.cs
+++ b/src/libraries/System.Runtime/ref/System.Runtime.cs
@@ -6059,7 +6059,7 @@ internal CompareInfo() { }
         public int IndexOf(string source, string value, int startIndex, int count) { throw null; }
         public int IndexOf(string source, string value, int startIndex, int count, System.Globalization.CompareOptions options) { throw null; }
         public bool IsPrefix(System.ReadOnlySpan<char> source, System.ReadOnlySpan<char> prefix, System.Globalization.CompareOptions options = System.Globalization.CompareOptions.None) { throw null; }
-        public bool IsPrefix(System.ReadOnlySpan<char> source, System.ReadOnlySpan<char> suffix, System.Globalization.CompareOptions options, out int matchLength) { throw null; }
+        public bool IsPrefix(System.ReadOnlySpan<char> source, System.ReadOnlySpan<char> prefix, System.Globalization.CompareOptions options, out int matchLength) { throw null; }
         public bool IsPrefix(string source, string prefix) { throw null; }
         public bool IsPrefix(string source, string prefix, System.Globalization.CompareOptions options) { throw null; }
         public static bool IsSortable(char ch) { throw null; }