diff --git a/Classes/HockeySDK.h b/Classes/HockeySDK.h
index cbc16cf676..81e672937d 100644
--- a/Classes/HockeySDK.h
+++ b/Classes/HockeySDK.h
@@ -95,7 +95,7 @@ typedef enum {
   BITHockeyErrorUnknown,
   HockeyAPIClientMissingJSONLibrary
 } BITHockeyErrorReason;
-NSString *kBITHockeyErrorDomain = @"BITHockeyErrorDomain";
+extern NSString *const kBITHockeyErrorDomain;
 
 
 #endif
diff --git a/Classes/HockeySDKPrivate.m b/Classes/HockeySDKPrivate.m
index 52c158d6a2..dc0d1f9da5 100644
--- a/Classes/HockeySDKPrivate.m
+++ b/Classes/HockeySDKPrivate.m
@@ -34,6 +34,7 @@
 NSString *const kBITCrashErrorDomain = @"BITCrashReporterErrorDomain";
 NSString *const kBITUpdateErrorDomain = @"BITUpdaterErrorDomain";
 NSString *const kBITFeedbackErrorDomain = @"BITFeedbackErrorDomain";
+NSString *const kBITHockeyErrorDomain = @"BITHockeyErrorDomain";
 
 // Load the framework bundle.
 NSBundle *BITHockeyBundle(void) {