diff --git a/init.zsh b/init.zsh
index 9b466450..d663b572 100644
--- a/init.zsh
+++ b/init.zsh
@@ -7,10 +7,9 @@
 #
 
 # Check for the minimum supported version.
-min_zsh_version='4.3.10'
+min_zsh_version='4.2.6'
 if ! autoload -Uz is-at-least || ! is-at-least "$min_zsh_version"; then
   print "omz: old shell detected, minimum required: $min_zsh_version" >&2
-  return 1
 fi
 unset min_zsh_version
 
diff --git a/modules/editor/init.zsh b/modules/editor/init.zsh
index 0fbd5711..bdeb9bdd 100644
--- a/modules/editor/init.zsh
+++ b/modules/editor/init.zsh
@@ -40,6 +40,13 @@
 #     zstyle ':omz:module:editor' completing '...'
 #
 
+# Check for the minimum supported version.
+min_zsh_version='4.3.10'
+if ! autoload -Uz is-at-least || ! is-at-least "$min_zsh_version"; then
+  return 1
+fi
+unset min_zsh_version
+
 # Dumb terminals lack support.
 if [[ "$TERM" == 'dumb' ]]; then
   return 1
diff --git a/modules/history-substring-search/init.zsh b/modules/history-substring-search/init.zsh
index a0ff287f..66fc0349 100644
--- a/modules/history-substring-search/init.zsh
+++ b/modules/history-substring-search/init.zsh
@@ -6,6 +6,13 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
+# Check for the minimum supported version.
+min_zsh_version='4.3.10'
+if ! autoload -Uz is-at-least || ! is-at-least "$min_zsh_version"; then
+  return 1
+fi
+unset min_zsh_version
+
 source "${0:h}/external/zsh-history-substring-search.zsh"
 
 if zstyle -t ':omz:module:history-substring-search' case-sensitive; then
diff --git a/modules/syntax-highlighting/init.zsh b/modules/syntax-highlighting/init.zsh
index 88ec7b47..297955db 100644
--- a/modules/syntax-highlighting/init.zsh
+++ b/modules/syntax-highlighting/init.zsh
@@ -5,6 +5,13 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
+# Check for the minimum supported version.
+min_zsh_version='4.3.10'
+if ! autoload -Uz is-at-least || ! is-at-least "$min_zsh_version"; then
+  return 1
+fi
+unset min_zsh_version
+
 if zstyle -t ':omz:module:syntax-highlighting' color; then
   source "${0:h}/external/zsh-syntax-highlighting.zsh"
 
diff --git a/modules/terminal/init.zsh b/modules/terminal/init.zsh
index d0bab0b7..b27e9b2b 100644
--- a/modules/terminal/init.zsh
+++ b/modules/terminal/init.zsh
@@ -6,6 +6,13 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
+# Check for the minimum supported version.
+min_zsh_version='4.3.10'
+if ! autoload -Uz is-at-least || ! is-at-least "$min_zsh_version"; then
+  return 1
+fi
+unset min_zsh_version
+
 # Dumb terminals lack support.
 if [[ "$TERM" == 'dumb' ]]; then
   return 1