diff --git a/acinclude.m4 b/acinclude.m4
index 58e1667c0d..e5906ab332 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -558,8 +558,8 @@ else
 			fi
 			_AFS_SYSNAME=`echo $AFS_SYSNAME|sed s/XX\$/$AFS_SYSKVERS/`
 			AFS_SYSNAME="$_AFS_SYSNAME"
-			AFS_ISUML=`echo $LINUX_VERSION | awk 'BEGIN {FS="-[[0-9]]+"} {print $[]2}'`
-			if test "x${AFS_ISUML}" = "xum"; then
+			AFS_ISUML=`cat /proc/cpuinfo | awk '/^model name/ {print $[]4}'`
+			if test "x${AFS_ISUML}" = "xUML"; then
 			 _AFS_SYSNAME=`echo $AFS_SYSNAME|sed s/linux/umlinux/`
 			fi
 			AFS_SYSNAME="$_AFS_SYSNAME"