diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/JsonHelpers.cs b/src/libraries/System.Text.Json/src/System/Text/Json/JsonHelpers.cs
index 4706b64753c971..ca1567138797ea 100644
--- a/src/libraries/System.Text.Json/src/System/Text/Json/JsonHelpers.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/JsonHelpers.cs
@@ -149,12 +149,12 @@ public static void ValidateInt32MaxArrayLength(uint length)
             }
         }
 
-        public static bool AllBitsEqual(this BitArray bitArray, bool value)
+#if !NET8_0_OR_GREATER
+        public static bool HasAllSet(this BitArray bitArray)
         {
-            // Optimize this when https://github.com/dotnet/runtime/issues/72999 is fixed
             for (int i = 0; i < bitArray.Count; i++)
             {
-                if (bitArray[i] != value)
+                if (!bitArray[i])
                 {
                     return false;
                 }
@@ -162,5 +162,6 @@ public static bool AllBitsEqual(this BitArray bitArray, bool value)
 
             return true;
         }
+#endif
     }
 }
diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/ReadStackFrame.cs b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/ReadStackFrame.cs
index f09907998f193b..01f9c7bb8a1c1a 100644
--- a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/ReadStackFrame.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/ReadStackFrame.cs
@@ -143,7 +143,7 @@ internal void ValidateAllRequiredPropertiesAreRead(JsonTypeInfo typeInfo)
             {
                 Debug.Assert(RequiredPropertiesSet != null);
 
-                if (!RequiredPropertiesSet.AllBitsEqual(true))
+                if (!RequiredPropertiesSet.HasAllSet())
                 {
                     ThrowHelper.ThrowJsonException_JsonRequiredPropertyMissing(typeInfo, RequiredPropertiesSet);
                 }