diff --git a/meta/recipes-devtools/tcltk/tcl_8.6.13.bb b/meta/recipes-devtools/tcltk/tcl_8.6.13.bb
index bb75353a5a..06bf900787 100644
--- a/meta/recipes-devtools/tcltk/tcl_8.6.13.bb
+++ b/meta/recipes-devtools/tcltk/tcl_8.6.13.bb
@@ -88,7 +88,7 @@ do_install_ptest() {
 
 do_install_ptest:append:libc-musl () {
 	# Assumes locales other than provided by musl-locales
-	sed -i -e "s|SKIPPED_TESTS='|SKIPPED_TESTS='unixInit-3* |" ${D}${PTEST_PATH}/run-ptest
+	sed -i '/SKIP="$SKIP socket.*$/a # unixInit-3* is suppressed due to hardcoded locale assumptions\nSKIP="$SKIP unixInit-3\\\*"' ${D}${PTEST_PATH}/run-ptest
 }
 
 # Fix some paths that might be used by Tcl extensions