diff --git a/mozilla/calendar/libxpical/Makefile.in b/mozilla/calendar/libxpical/Makefile.in
index 228ed9ca304..408ae6b735c 100644
--- a/mozilla/calendar/libxpical/Makefile.in
+++ b/mozilla/calendar/libxpical/Makefile.in
@@ -51,6 +51,7 @@ MODULE_NAME	= oeICalModule
 REQUIRES	= xpcom \
 		  appshell \
 		  string \
+		  timer \
 		  $(NULL)
 
 XPIDLSRCS = oeIICal.idl
diff --git a/mozilla/calendar/libxpical/makefile.win b/mozilla/calendar/libxpical/makefile.win
index 469e2cee376..dc6e06f7e6f 100644
--- a/mozilla/calendar/libxpical/makefile.win
+++ b/mozilla/calendar/libxpical/makefile.win
@@ -45,6 +45,7 @@ REQUIRES        = xpcom \
                   libical \
                   libicalss \
                   libicalvcal \
+		  timer \
                   $(NULL)
 include <$(DEPTH)/config/config.mak>