diff --git a/gcc/mpfr/Makefile.in b/gcc/mpfr/Makefile.in
index 6713836013..d9c8a75f4e 100644
--- a/gcc/mpfr/Makefile.in
+++ b/gcc/mpfr/Makefile.in
@@ -1666,7 +1666,7 @@ uninstall-info: uninstall-info-recursive
 
 
 get_patches.c: PATCHES get_patches.sh
-	./get_patches.sh > $@ || rm -f $@
+	$(srcdir)/get_patches.sh > $@ || rm -f $@
 
 tune:
 	$(MAKE) $(AM_MAKEFLAGS) tuneup$(EXEEXT)