diff --git a/internal/rosa/mksh.go b/internal/rosa/mksh.go
index 59784276..fedc3f84 100644
--- a/internal/rosa/mksh.go
+++ b/internal/rosa/mksh.go
@@ -7,6 +7,10 @@ func (t Toolchain) newMksh() (pkg.Artifact, string) {
 		version  = "59c"
 		checksum = "0Zj-k4nXEu3IuJY4lvwD2OrC2t27GdZj8SPy4DoaeuBRH1padWb7oREpYgwY8JNq"
 	)
+	scriptTest := "./test.sh -C regress:no-ctty\n"
+	if presetOpts&OptSkipCheck != 0 {
+		scriptTest = ""
+	}
 	return t.New("mksh-"+version, 0, t.AppendPresets(nil,
 		Perl,
 		Coreutils,
@@ -18,8 +22,7 @@ cd "$(mktemp -d)"
 sh /usr/src/mksh/Build.sh -r
 CPPFLAGS="${CPPFLAGS} -DMKSH_BINSHPOSIX -DMKSH_BINSHREDUCED" \
 sh /usr/src/mksh/Build.sh -r -L
-./test.sh -C regress:no-ctty
-
+`+scriptTest+`
 mkdir -p /work/system/bin/
 cp -v mksh /work/system/bin/
 cp -v lksh /work/system/bin/sh