Index: share/mk/atf.test.mk
===================================================================
--- share/mk/atf.test.mk
+++ share/mk/atf.test.mk
@@ -97,8 +97,11 @@
 # this proves to be useful within the tests.
 ATF_TESTS_KSH93_SED_${_T}?= # empty
 ATF_TESTS_KSH93_SRC_${_T}?= ${_T}.sh
+# Note: The ATF_TESTS_KSH93 scripts are actually POSIX sh scripts that invoke
+# ksh93 scripts. Setting the interpreter to /usr/local/bin/ksh93 breaks
+# `kyua list` as it tries to invoke the script with a non-existent interpreter.
 ${_T}: ${ATF_TESTS_KSH93_SRC_${_T}}
-	echo '#! /usr/libexec/atf-sh -s/usr/local/bin/ksh93' > ${.TARGET}.tmp
+	echo '#! /usr/libexec/atf-sh' > ${.TARGET}.tmp
 .if empty(ATF_TESTS_KSH93_SED_${_T})
 	cat ${.ALLSRC:N*Makefile*} >>${.TARGET}.tmp
 .else