diff --git a/scripts/sstate-diff-machines.sh b/scripts/sstate-diff-machines.sh
index 056aa0a04c..27c6a33006 100755
--- a/scripts/sstate-diff-machines.sh
+++ b/scripts/sstate-diff-machines.sh
@@ -118,7 +118,7 @@ for M in ${machines}; do
     cp -ra ${tmpdir}/stamps/* ${OUTPUT}/${M}
     find ${OUTPUT}/${M} -name \*sigdata\* | sed "s#${OUTPUT}/${M}/##g" | sort > ${OUTPUT}/${M}/list
     M_UNDERSCORE=`echo ${M} | sed 's/-/_/g'`
-    sed "s/${M_UNDERSCORE}/MACHINE/g; s/${M}/MACHINE/g" ${OUTPUT}/${M}/list | sort > ${OUTPUT}/${M}/list.M
+    sed "s/^${M_UNDERSCORE}-/MACHINE/g" ${OUTPUT}/${M}/list | sort > ${OUTPUT}/${M}/list.M
     find ${tmpdir}/stamps/ -name \*sigdata\* | xargs rm -f
   else
     printf "ERROR: no sigdata files were generated for MACHINE $M in ${tmpdir}/stamps\n";