diff --git a/Classes/ContactsTableViewController.m b/Classes/ContactsTableViewController.m
index 2dd00fc26..791aac85e 100644
--- a/Classes/ContactsTableViewController.m
+++ b/Classes/ContactsTableViewController.m
@@ -27,6 +27,9 @@
 
 @implementation ContactsTableViewController
 
+static void sync_address_book (ABAddressBookRef addressBook, CFDictionaryRef info, void *context);
+
+
 #pragma mark - Lifecycle Functions
 
 - (void)initContactsTableViewController {
diff --git a/Classes/Utils/FastAddressBook.m b/Classes/Utils/FastAddressBook.m
index ee5d2ffeb..d8d9f7716 100644
--- a/Classes/Utils/FastAddressBook.m
+++ b/Classes/Utils/FastAddressBook.m
@@ -22,6 +22,8 @@
 
 @implementation FastAddressBook
 
+static void sync_address_book (ABAddressBookRef addressBook, CFDictionaryRef info, void *context);
+
 + (NSString*)getContactDisplayName:(ABRecordRef)contact {
     NSString *retString = nil;
     if (contact) {