diff --git a/zsh/functions.zsh b/zsh/functions.zsh
index c82beec..29772d6 100644
--- a/zsh/functions.zsh
+++ b/zsh/functions.zsh
@@ -16,10 +16,6 @@ viscd() {
   rm -f -- "$temp_file"
 }
 
-is_linux()   { [[ "$OSTYPE" == linux*        ]]; }
-is_macos()   { [[ "$OSTYPE" == darwin*       ]]; }
-is_android() { [[ "$OSTYPE" == linux-android ]]; }
-
 command_exists() { command -v "$1" &>/dev/null; }
 
 lazy_load() {
@@ -33,8 +29,8 @@ lazy_load() {
   }"
 }
 
-if ! is_macos; then
-  if is_android; then
+if (( ! _is_macos )); then
+  if (( _is_android )); then
     open_cmd='termux-open'
   elif command_exists xdg-open; then
     open_cmd='nohup xdg-open &> /dev/null'
@@ -45,7 +41,7 @@ if ! is_macos; then
   unset open_cmd
 fi
 
-if is_macos; then
+if (( _is_macos )); then
   copy_cmd='pbcopy' paste_cmd='pbpaste'
 elif command_exists xclip; then
   copy_cmd='xclip -in -selection clipboard' paste_cmd='xclip -out -selection clipboard'
diff --git a/zsh/path.zsh b/zsh/path.zsh
index 37ea188..6cc275d 100644
--- a/zsh/path.zsh
+++ b/zsh/path.zsh
@@ -17,7 +17,7 @@ path_prepend() {
   done
 }
 
-if is_macos; then
+if (( _is_macos )); then
   # local Python binaries (for some reason they don't go into ~/.local/bin, but
   # instead into the garbage ~/Library directory)
   path_prepend path ~/Library/Python/*/bin(OnN)
diff --git a/zsh/zshrc b/zsh/zshrc
index b9ec0b2..729b50e 100644
--- a/zsh/zshrc
+++ b/zsh/zshrc
@@ -33,6 +33,19 @@ autoload -U colors && colors
 
 _perf_timer_start "total"
 
+# platform identification {{{
+  if [[ "$OSTYPE" == linux* ]]; then
+    _is_linux=1
+    if [[ "$OSTYPE" == linux-android ]]; then
+      _is_android=1
+    fi
+  fi
+
+  if [[ "$OSTYPE" == darwin* ]]; then
+    _is_macos=1
+  fi
+# }}}
+
 for script in functions options path env plugins aliases completion zle prompt colorscheme; do
   _perf_timer_start "$script.zsh"
   source "$ZSH_DOTFILES/$script.zsh"