diff --git a/ICSharpCode.Decompiler/TypeSystem/Implementation/AttributeListBuilder.cs b/ICSharpCode.Decompiler/TypeSystem/Implementation/AttributeListBuilder.cs
index fc3f2e385..b1d040a8f 100644
--- a/ICSharpCode.Decompiler/TypeSystem/Implementation/AttributeListBuilder.cs
+++ b/ICSharpCode.Decompiler/TypeSystem/Implementation/AttributeListBuilder.cs
@@ -199,7 +199,7 @@ namespace ICSharpCode.Decompiler.TypeSystem.Implementation
 						case "ExtensionAttribute":
 							return (options & TypeSystemOptions.ExtensionMethods) != 0;
 						case "DecimalConstantAttribute":
-							return (options & TypeSystemOptions.DecimalConstants) != 0 && target == SymbolKind.Field;
+							return (options & TypeSystemOptions.DecimalConstants) != 0 && (target == SymbolKind.Field || target == SymbolKind.Parameter);
 						case "IsReadOnlyAttribute":
 							return (options & TypeSystemOptions.ReadOnlyStructsAndParameters) != 0;
 						case "IsByRefLikeAttribute":