diff --git a/Classes/ContactDetailsViewController.m b/Classes/ContactDetailsViewController.m
index d8cac2053..071f038d3 100644
--- a/Classes/ContactDetailsViewController.m
+++ b/Classes/ContactDetailsViewController.m
@@ -29,6 +29,8 @@
 @synthesize cancelButton;
 
 
+static void sync_address_book (ABAddressBookRef addressBook, CFDictionaryRef info, void *context);
+
 #pragma mark - Lifecycle Functions
 
 - (id)init  {
diff --git a/Classes/LinphoneManager.m b/Classes/LinphoneManager.m
index ea7670878..744ec7528 100644
--- a/Classes/LinphoneManager.m
+++ b/Classes/LinphoneManager.m
@@ -35,6 +35,12 @@
 #include "lpconfig.h"
 
 
+static void audioRouteChangeListenerCallback (
+                                              void                   *inUserData,                                 // 1
+                                              AudioSessionPropertyID inPropertyID,                                // 2
+                                              UInt32                 inPropertyValueSize,                         // 3
+                                              const void             *inPropertyValue                             // 4
+                                              );
 static LinphoneCore* theLinphoneCore = nil;
 static LinphoneManager* theLinphoneManager = nil;