diff --git a/Sources/CoreAPI/WordPressOrgXMLRPCApiError+NSErrorBridge.swift b/Sources/CoreAPI/WordPressOrgXMLRPCApiError+NSErrorBridge.swift
index 55661d56..312e9361 100644
--- a/Sources/CoreAPI/WordPressOrgXMLRPCApiError+NSErrorBridge.swift
+++ b/Sources/CoreAPI/WordPressOrgXMLRPCApiError+NSErrorBridge.swift
@@ -1,3 +1,5 @@
+import Foundation
+
 /// See `extension WordPressComRestApiEndpointError: CustomNSError` for documentation and rationale.
 extension WordPressOrgXMLRPCApiError: CustomNSError {
 
diff --git a/Sources/CoreAPI/WordPressOrgXMLRPCApiErrorDomain.swift b/Sources/CoreAPI/WordPressOrgXMLRPCApiErrorDomain.swift
index b04cf038..5fc4d838 100644
--- a/Sources/CoreAPI/WordPressOrgXMLRPCApiErrorDomain.swift
+++ b/Sources/CoreAPI/WordPressOrgXMLRPCApiErrorDomain.swift
@@ -1,3 +1,5 @@
+import Foundation
+
 /// Error domain of `NSError` instances that are converted from `WordPressOrgXMLRPCApiError`
 /// and `WordPressAPIError<WordPressOrgXMLRPCApiError>` instances.
 ///