diff --git a/Makefile.in b/GNUmakefile.in
similarity index 99%
rename from Makefile.in
rename to GNUmakefile.in
index bf71cfb..7e3b25e 100644
--- a/Makefile.in
+++ b/GNUmakefile.in
@@ -112,10 +112,10 @@ clean:
 distclean: clean
 	$(RM) -r autom4te.cache
 	$(RM) configure config.status config.log
-	$(RM) Makefile
+	$(RM) GNUmakefile
 
 depend:
-	cd "@SRCDIR@" && makedepend -Y -fMakefile.in -o.c.o -- $(CSTD) $(ED25519_DEFS) -- $(ALL_C)
+	cd "@SRCDIR@" && makedepend -Y -fGNUmakefile.in -o.c.o -- $(CSTD) $(ED25519_DEFS) -- $(ALL_C)
 
 VPATH=@SRCDIR@
 
diff --git a/configure.ac b/configure.ac
index 9766467..f4804fa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -351,4 +351,4 @@ AC_SUBST(MYDEFS,["$MYDEFS"])
 AC_SUBST(MAINLIB,["$MAINLIB"])
 AC_SUBST(NOPIE,["$nopie"])
 AC_SUBST(SRCDIR,["$srcdir"])
-AC_OUTPUT(Makefile)
+AC_OUTPUT(GNUmakefile)