diff --git a/mozilla/intl/locale/src/nsLocaleConstructors.h b/mozilla/intl/locale/src/nsLocaleConstructors.h
index 6da3e484307..25aa60c7cf2 100644
--- a/mozilla/intl/locale/src/nsLocaleConstructors.h
+++ b/mozilla/intl/locale/src/nsLocaleConstructors.h
@@ -64,6 +64,12 @@
 #include "nsDateTimeFormatWin.h"
 #endif
 
+#ifdef XP_OS2
+#include "nsIOS2Locale.h"
+#include "nsCollationOS2.h"
+#include "nsDateTimeFormatOS2.h"
+#endif
+
 #ifdef USE_MAC_LOCALE
 #ifdef USE_UCCOLLATIONKEY
 #include "nsCollationMacUC.h"