diff --git a/build/bakefiles/common.bkl b/build/bakefiles/common.bkl
index 46b2b7c68d..860205146c 100644
--- a/build/bakefiles/common.bkl
+++ b/build/bakefiles/common.bkl
@@ -256,8 +256,10 @@
         <libname>$(WXLIBNAME)</libname>
 
         <if cond="FORMAT!='autoconf'">
-            <sources>src/msw/dummy.cpp</sources>
-            <precomp-headers-gen>src/msw/dummy.cpp</precomp-headers-gen>
+            <sources>$(WXTOPDIR)src/msw/dummy.cpp</sources>
+            <precomp-headers-gen>
+                $(WXTOPDIR)src/msw/dummy.cpp
+            </precomp-headers-gen>
         </if>
         <precomp-headers-header>wx/wxprec.h</precomp-headers-header>
         <precomp-headers>on</precomp-headers>