diff --git a/lib/general.sh b/lib/general.sh
index 23c6033d..25238bb1 100644
--- a/lib/general.sh
+++ b/lib/general.sh
@@ -1,11 +1,11 @@
 #shellcheck shell=sh disable=SC2004,SC2016
 
-# Workaround for ksh 2020
-if [ "${KSH_VERSION:-}" ]; then
+# Workaround for ksh 2020: Heisenbug
+case "${KSH_VERSION:-}" in (*2020*)
   ( exec 3>/dev/null 4>&3 5>&3 6>&3 7>&3 8>&3 9>&3
     eval "dummy() { $(printf %8192s :); }"
   ) 3>&- 4>&- 5>&- 6>&- 7>&- 8>&- 9>&-
-fi
+esac
 
 : "${SHELLSPEC_SHELL_TYPE:=}" "${SHELLSPEC_SHELL_VERSION:=}"
 SHELLSPEC_SH_VERSION=$(eval 'echo "${.sh.version}"' 2>/dev/null) ||:
diff --git a/libexec/shellspec-translate.sh b/libexec/shellspec-translate.sh
index 47f7b6cb..82b1a886 100755
--- a/libexec/shellspec-translate.sh
+++ b/libexec/shellspec-translate.sh
@@ -9,6 +9,11 @@ use escape_quote
 
 delimiter="DELIMITER-$SHELLSPEC_UNIXTIME-$$"
 
+disable_virtual_subshell() {
+  [ "$SHELLSPEC_SHELL_TYPE" = ksh ] || return 0
+  putsn 'ulimit -t $(ulimit -t)'
+}
+
 trans() {
   # shellcheck disable=SC2145
   "trans_$@"
@@ -16,6 +21,7 @@ trans() {
 
 trans_block_example_group() {
   putsn "("
+  disable_virtual_subshell
   [ "$skipped" ] && trans_skip ""
   putsn "shellspec_group_id $block_id $block_no"
   putsn "SHELLSPEC_LINENO_BEGIN=$lineno_begin"
@@ -28,6 +34,7 @@ trans_block_example_group() {
 
 trans_block_example() {
   putsn "("
+  disable_virtual_subshell
   [ "$skipped" ] && trans_skip ""
   putsn "shellspec_example_id $block_id $example_no $block_no"
   putsn "SHELLSPEC_LINENO_BEGIN=$lineno_begin"