diff --git a/Makefile.am b/Makefile.am
index 42e121feb..43635d5ff 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -60,7 +60,7 @@ libgrub_a_init.c: libgrub_a_init.lst $(top_srcdir)/geninit.sh
 CLEANFILES += libgrub_a_init.c
 
 # For grub-fstest
-grub_fstest.pp: $(grub_fstest_SOURCES)
+grub_fstest.pp: config-util.h $(grub_fstest_SOURCES)
 	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(grub_fstest_CPPFLAGS) $(CPPFLAGS) \
 	  -D'GRUB_MOD_INIT(x)=@MARKER@x@' $^ > $@ || (rm -f $@; exit 1)
 CLEANFILES += grub_fstest.pp