diff --git a/libexec/pyenv-init b/libexec/pyenv-init
index 8bc8bc36..c1e0da7b 100755
--- a/libexec/pyenv-init
+++ b/libexec/pyenv-init
@@ -109,7 +109,12 @@ function detect_profile() {
     profile='~/.zprofile'
     rc='~/.zshrc'
     ;;
-  ksh )
+  ksh | ksh93 | mksh )
+    # There are two implementations of Korn shell: AT&T (ksh93) and Mir (mksh).
+    # Systems may have them installed under those names, or as ksh, so those
+    # are recognized here. The obsolete ksh88 (subsumed by ksh93) and pdksh
+    # (subsumed by mksh) are not included, since they are unlikely to still
+    # be in use as interactive shells anywhere.
     profile='~/.profile'
     rc='~/.profile'
     ;;
@@ -269,7 +274,7 @@ function pyenv
 end
 EOS
     ;;
-  ksh )
+  ksh | ksh93 | mksh )
     cat <<EOS
 function pyenv {
   typeset command