diff --git a/Makefile b/Makefile
index 09d3b20..f32b5df 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ MAKECMDGOALS := $(filter-out $(ARCH),$(MAKECMDGOALS))
 ARCHS        := $(filter-out any,$(ARCHS))
 
 ifeq ($(ARCH),)
-ARCH         := x86-64
+ARCH         := x86_64
 endif
 
 ifeq (,$(findstring -S,$(COMMANDLINE)))
diff --git a/Makefile.conf.x86-64 b/Makefile.conf.x86_64
similarity index 60%
rename from Makefile.conf.x86-64
rename to Makefile.conf.x86_64
index 8b6f107..caa2547 100644
--- a/Makefile.conf.x86-64
+++ b/Makefile.conf.x86_64
@@ -1,8 +1,8 @@
 #
-# Makefile.conf.x86-64
+# Makefile.conf.x86_64
 #
 
-ARCH := x86-64
+ARCH := x86_64
 
 AR := ar
 CC := g++