diff --git a/Sources/SafeDICore/Errors/FixableInstantiableError.swift b/Sources/SafeDICore/Errors/FixableInstantiableError.swift
index 138a297..aa486f1 100644
--- a/Sources/SafeDICore/Errors/FixableInstantiableError.swift
+++ b/Sources/SafeDICore/Errors/FixableInstantiableError.swift
@@ -33,7 +33,7 @@ public enum FixableInstantiableError: DiagnosticError {
     case missingPublicOrOpenAttribute
     case missingRequiredInitializer(MissingInitializer)
 
-    public enum MissingInitializer {
+    public enum MissingInitializer: Sendable {
         case hasOnlyInjectableProperties
         case hasInjectableAndNotInjectableProperties
         case hasNoInjectableProperties