diff --git a/SoObjects/SOGo/WORequest+SOGo.m b/SoObjects/SOGo/WORequest+SOGo.m
index 164c87c16f..267606c10c 100644
--- a/SoObjects/SOGo/WORequest+SOGo.m
+++ b/SoObjects/SOGo/WORequest+SOGo.m
@@ -262,7 +262,9 @@ - (BOOL) isMacOSXCalendar
 
 - (BOOL) isThunderbird
 {
-  return ([[self headerForKey:@"user-agent"] rangeOfString: @"Thunderbird"].location != NSNotFound);
+  BOOL ret;
+  ret = ([[self headerForKey:@"user-agent"] rangeOfString: @"Thunderbird"].location != NSNotFound);
+  return ret;
 }
 
 @end