diff --git a/src/System.Memory/src/System/SpanHelpers.T.cs b/src/System.Memory/src/System/SpanHelpers.T.cs
index 1c0717e3677b..00572573429e 100644
--- a/src/System.Memory/src/System/SpanHelpers.T.cs
+++ b/src/System.Memory/src/System/SpanHelpers.T.cs
@@ -63,10 +63,7 @@ public static int LastIndexOfAny<T>(ref T searchSpace, int searchSpaceLength, re
             for (int i = 0; i < valueLength; i++)
             {
                 var tempIndex = LastIndexOf(ref searchSpace, Unsafe.Add(ref value, i), searchSpaceLength);
-                if (tempIndex != -1)
-                {
-                    index = (index == -1 || index < tempIndex) ? tempIndex : index;
-                }
+                if (tempIndex > index) index = tempIndex;
             }
             return index;
         }
diff --git a/src/System.Memory/src/System/SpanHelpers.byte.cs b/src/System.Memory/src/System/SpanHelpers.byte.cs
index 89d6139aeaa3..c0f07296e7f9 100644
--- a/src/System.Memory/src/System/SpanHelpers.byte.cs
+++ b/src/System.Memory/src/System/SpanHelpers.byte.cs
@@ -64,10 +64,7 @@ public static int IndexOfAny(ref byte searchSpace, int searchSpaceLength, ref by
             for (int i = 0; i < valueLength; i++)
             {
                 var tempIndex = IndexOf(ref searchSpace, Unsafe.Add(ref value, i), searchSpaceLength);
-                if (tempIndex != -1)
-                {
-                    index = (index == -1 || index > tempIndex) ? tempIndex : index;
-                }
+                if ((uint)tempIndex < (uint)index) index = tempIndex;
             }
             return index;
         }
@@ -84,10 +81,7 @@ public static int LastIndexOfAny(ref byte searchSpace, int searchSpaceLength, re
             for (int i = 0; i < valueLength; i++)
             {
                 var tempIndex = LastIndexOf(ref searchSpace, Unsafe.Add(ref value, i), searchSpaceLength);
-                if (tempIndex != -1)
-                {
-                    index = (index == -1 || index < tempIndex) ? tempIndex : index;
-                }
+                if (tempIndex > index) index = tempIndex;
             }
             return index;
         }