diff --git a/calendar/sunbird/app/Makefile.in b/calendar/sunbird/app/Makefile.in
--- a/calendar/sunbird/app/Makefile.in
+++ b/calendar/sunbird/app/Makefile.in
@@ -187,17 +187,17 @@ EXTRA_LIBS	+= $(STATIC_EXTRA_LIBS)
 # OpenGL is required by (mozilla/)content/canvas: see (mozilla/)layout/build/Makefile.in.
 ifeq (cocoa,$(MOZ_WIDGET_TOOLKIT))
 OS_LIBS += -framework OpenGL
 endif
 
 endif # BUILD_STATIC_LIBS
 
 ifeq ($(OS_ARCH),WINNT)
-OS_LIBS += $(call EXPAND_LIBNAME,comctl32 comdlg32 uuid shell32 ole32 oleaut32 version winspool)
+OS_LIBS += $(call EXPAND_LIBNAME,comctl32 comdlg32 uuid shell32 ole32 oleaut32 version winspool shlwapi)
 OS_LIBS += $(call EXPAND_LIBNAME,usp10 msimg32)
 RCINCLUDE = splash.rc
 ifndef GNU_CC
 RCFLAGS += -DMOZ_SUNBIRD -I$(srcdir)
 else
 RCFLAGS += -DMOZ_SUNBIRD --include-dir $(srcdir)
 endif
 ifdef BUILD_STATIC_LIBS