diff --git a/build/aclocal.makefile.m4 b/build/aclocal.makefile.m4
index 29fb07a2d..584776cab 100644
--- a/build/aclocal.makefile.m4
+++ b/build/aclocal.makefile.m4
@@ -71,7 +71,7 @@ AC_DEFUN([CAIRO_CONFIG_MAKEFILE_PRIVATE],
 
 	dnl Accumulators
 	CAIRO_ACCUMULATORS_REGISTER(MAKEFILE_$1_AMAKE, m4_newline, [# Generated by configure.  Do not edit.]m4_newline[include $(top_srcdir)/$2/Makefile.sources]m4_newline)dnl
-	CAIRO_ACCUMULATORS_REGISTER(MAKEFILE_$1_WIN32, m4_newline, [# Generated by configure.  Do not edit.]m4_newline[include Makefile.sources]m4_newline)dnl
+	CAIRO_ACCUMULATORS_REGISTER(MAKEFILE_$1_WIN32, m4_newline, [# Generated by configure.  Do not edit.]m4_newline[ifeq ($(top_srcdir),)]m4_newline[include Makefile.sources]m4_newline[else]m4_newline[include $(top_srcdir)/$2/Makefile.sources]m4_newline[endif]m4_newline)dnl
 
 	dnl Generate
 	CAIRO_CONFIG_COMMANDS([$srcdir/$2/Makefile.am.features],