diff --git a/src/libraries/System.Private.CoreLib/src/System/SpanHelpers.T.cs b/src/libraries/System.Private.CoreLib/src/System/SpanHelpers.T.cs
index 35b69944f883cc..df5427cd075dc4 100644
--- a/src/libraries/System.Private.CoreLib/src/System/SpanHelpers.T.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/SpanHelpers.T.cs
@@ -3794,7 +3794,7 @@ public static int Count<T>(ref T current, T value, int length) where T : IEquata
             return count;
         }
 
-        public static unsafe int CountValueType<T>(ref T current, T value, int length) where T : struct, IEquatable<T>?
+        public static unsafe int CountValueType<T>(ref T current, T value, int length) where T : struct, IEquatable<T>
         {
             int count = 0;
             ref T end = ref Unsafe.Add(ref current, length);