diff --git a/webshell/embed/makefile.win b/webshell/embed/makefile.win
index 25b0de29c9d..579de5f1973 100644
--- a/webshell/embed/makefile.win
+++ b/webshell/embed/makefile.win
@@ -18,15 +18,13 @@
 DEPTH=..\..
 IGNORE_MANIFEST=1
 
-!if ("$(MSSDK)" != "") || defined(NGPREFS)
-DIRS= \
-!if "$(MSSDK)" != ""
-      ActiveX \
-!endif
-!if defined(NGPREFS)
-      ngprefs \
-!endif
-      $(NULL)
+!if defined(MOZ_ACTIVEX_SUPPORT)
+DIRS = $(DIRS) ActiveX
 !endif
 
+!if defined(NGPREFS)
+DIRS = $(DIRS) ngprefs
+!endif
+
+
 include <$(DEPTH)\config\rules.mak>