diff --git a/Makefile b/Makefile
index 9a6b9ef..0579ccb 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,7 @@
 include config/version
 
 SHELL = /bin/sh
-SYSTEM ?= $(shell config/config.guess | cut -d - -f 3 | sed -e 's/[0-9\.]//g;')
+SYSTEM ?= $(shell config/config.guess | cut -d - -f 3 | sed -e 's/\.//g' -e 's/[0-9]\{1,\}.*//')
 SYSTEM.SUPPORTED = $(shell test -f config/Makefile.$(SYSTEM) && echo 1)
 
 ifeq ($(SYSTEM.SUPPORTED), 1)