diff --git a/mozilla/widget/timer/src/mac/nsTimer.cpp b/mozilla/widget/timer/src/mac/nsTimer.cpp
index 8a6b2cff3e1..d72c5d2cf96 100644
--- a/mozilla/widget/timer/src/mac/nsTimer.cpp
+++ b/mozilla/widget/timer/src/mac/nsTimer.cpp
@@ -342,7 +342,7 @@ void  TimerPeriodical::RepeatAction( const EventRecord &inMacEvent)
 }
 
                 
-nsresult NS_NewTimer(nsITimer** aInstancePtrResult)
+PR_PUBLIC_API(nsresult) NS_NewTimer(nsITimer** aInstancePtrResult)
 {
     NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
     if (nsnull == aInstancePtrResult) {