diff --git a/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterEarlyWellKnownAttributeData.cs b/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterEarlyWellKnownAttributeData.cs
index 3bcfe343f2c40..13a6d13e597c1 100644
--- a/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterEarlyWellKnownAttributeData.cs
+++ b/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterEarlyWellKnownAttributeData.cs
@@ -11,5 +11,20 @@ namespace Microsoft.CodeAnalysis.CSharp.Symbols
     /// </summary>
     internal sealed class ParameterEarlyWellKnownAttributeData : CommonParameterEarlyWellKnownAttributeData
     {
+        private bool _hasRefEscapesAttribute;
+        public bool HasRefEscapesAttribute
+        {
+            get
+            {
+                VerifySealed(expected: true);
+                return _hasRefEscapesAttribute;
+            }
+            set
+            {
+                VerifySealed(expected: false);
+                _hasRefEscapesAttribute = value;
+                SetDataStored();
+            }
+        }
     }
 }
diff --git a/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterWellKnownAttributeData.cs b/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterWellKnownAttributeData.cs
index c59ed4004098e..2275e9dc1c290 100644
--- a/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterWellKnownAttributeData.cs
+++ b/src/Compilers/CSharp/Portable/Symbols/Attributes/WellKnownAttributeData/ParameterWellKnownAttributeData.cs
@@ -142,22 +142,6 @@ public bool HasEnumeratorCancellationAttribute
             }
         }
 
-        private bool _hasRefEscapesAttribute;
-        public bool HasRefEscapesAttribute
-        {
-            get
-            {
-                VerifySealed(expected: true);
-                return _hasRefEscapesAttribute;
-            }
-            set
-            {
-                VerifySealed(expected: false);
-                _hasRefEscapesAttribute = value;
-                SetDataStored();
-            }
-        }
-
         private ImmutableHashSet<string> _notNullIfParameterNotNull = ImmutableHashSet<string>.Empty;
         public ImmutableHashSet<string> NotNullIfParameterNotNull
         {
diff --git a/src/Compilers/CSharp/Portable/Symbols/Source/SourceComplexParameterSymbol.cs b/src/Compilers/CSharp/Portable/Symbols/Source/SourceComplexParameterSymbol.cs
index 0dd6a825fa54a..9c4e1775400c7 100644
--- a/src/Compilers/CSharp/Portable/Symbols/Source/SourceComplexParameterSymbol.cs
+++ b/src/Compilers/CSharp/Portable/Symbols/Source/SourceComplexParameterSymbol.cs
@@ -196,7 +196,7 @@ internal bool HasEnumeratorCancellationAttribute
             }
         }
 
-        internal bool HasRefEscapesAttribute => GetDecodedWellKnownAttributeData()?.HasRefEscapesAttribute == true;
+        internal bool HasRefEscapesAttribute => GetEarlyDecodedWellKnownAttributeData()?.HasRefEscapesAttribute == true;
 
 #nullable enable
 
@@ -595,6 +595,10 @@ internal override (CSharpAttributeData?, BoundAttribute?) EarlyDecodeWellKnownAt
             {
                 return EarlyDecodeAttributeForDefaultParameterValue(AttributeDescription.DateTimeConstantAttribute, ref arguments);
             }
+            else if (CSharpAttributeData.IsTargetEarlyAttribute(arguments.AttributeType, arguments.AttributeSyntax, AttributeDescription.RefEscapesAttribute))
+            {
+                return arguments.Binder.GetAttribute(arguments.AttributeSyntax, arguments.AttributeType, beforeAttributePartBound: null, afterAttributePartBound: null, out bool _);
+            }
             else if (!IsOnPartialImplementation(arguments.AttributeSyntax))
             {
                 if (CSharpAttributeData.IsTargetEarlyAttribute(arguments.AttributeType, arguments.AttributeSyntax, AttributeDescription.CallerLineNumberAttribute))
@@ -794,11 +798,6 @@ protected override void DecodeWellKnownAttributeImpl(ref DecodeWellKnownAttribut
             {
                 DecodeInterpolatedStringHandlerArgumentAttribute(ref arguments, diagnostics, index);
             }
-            else if (attribute.IsTargetAttribute(this, AttributeDescription.RefEscapesAttribute))
-            {
-                // PROTOTYPE: Should this be an early decoded attribute? Create a test that manifests a difference.
-                arguments.GetOrCreateData<ParameterWellKnownAttributeData>().HasRefEscapesAttribute = true;
-            }
         }
 
         private static bool? DecodeMaybeNullWhenOrNotNullWhenOrDoesNotReturnIfAttribute(AttributeDescription description, CSharpAttributeData attribute)