diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index 9bc2419..0e21256 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -149,7 +149,7 @@
 
 # Get the default ARCH.
 ifndef ARCH
-ARCH := $(shell $(CC) -dumpmachine | sed -e 's/-.*//')
+ARCH := $(shell $(CC) -dumpmachine | sed -e 's/-.*//' -e 's/_/-/')
 endif