diff --git a/OpenUDID.m b/OpenUDID.m
index 904066e..d535eda 100644
--- a/OpenUDID.m
+++ b/OpenUDID.m
@@ -363,6 +363,8 @@ + (NSString*) valueWithError:(NSError **)error {
     //
     if (localDict && saveLocalDictToDefaults)
         [defaults setObject:localDict forKey:kOpenUDIDKey];
+	
+	[defaults synchronize];
 
     // If the UIPasteboard external representation marks this app as opted-out, then to respect privacy, we return the ZERO OpenUDID, a sequence of 40 zeros...
     // This is a *new* case that developers have to deal with. Unlikely, statistically low, but still.