diff --git a/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift b/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift
index 2f760f1..e565566 100644
--- a/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift
+++ b/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift
@@ -123,7 +123,7 @@ extension EnumeratorMacroType: MemberMacro {
                         Diagnostic(
                             node: codeSyntax,
                             message: MacroError.internalError(
-                                "Could not convert an CodeBlockItemSyntax to a DeclSyntax"
+                                "Could not convert a CodeBlockItemSyntax to a DeclSyntax"
                             )
                         )
                     )