diff --git a/js/src/jsdate.cpp b/js/src/jsdate.cpp
index ecfc9c838c8..64dd584ac4e 100644
--- a/js/src/jsdate.cpp
+++ b/js/src/jsdate.cpp
@@ -2449,16 +2449,16 @@ js_DateGetMsecSinceEpoch(JSContext *cx, JSObject *obj)
 #ifdef JS_THREADSAFE
 #include "prinrval.h"
 
-uint32 
-js_IntervalNow() 
+JS_FRIEND_API(uint32)
+js_IntervalNow()
 {
     return uint32(PR_IntervalToMilliseconds(PR_IntervalNow()));
 }
 
 #else /* !JS_THREADSAFE */
 
-uint32 
-js_IntervalNow() 
+JS_FRIEND_API(uint32)
+js_IntervalNow()
 {
     return uint32(PRMJ_Now() / PRMJ_USEC_PER_MSEC);
 }
diff --git a/js/src/jsdate.h b/js/src/jsdate.h
index c6e81d970c7..85e49320422 100644
--- a/js/src/jsdate.h
+++ b/js/src/jsdate.h
@@ -121,7 +121,7 @@ js_DateGetMsecSinceEpoch(JSContext *cx, JSObject *obj);
 
 typedef uint32 JSIntervalTime;
 
-JSIntervalTime
+extern JS_FRIEND_API(JSIntervalTime)
 js_IntervalNow();
 
 JS_END_EXTERN_C