diff --git a/install-tmux.ps1 b/install-tmux.ps1
index 2aba93d..d93a134 100644
--- a/install-tmux.ps1
+++ b/install-tmux.ps1
@@ -52,7 +52,7 @@ Info "Installing tmux..."
 $tmuxCmd = Get-Command tmux -ErrorAction SilentlyContinue
 if ($tmuxCmd) {
     $currentVer = & tmux -V 2>$null
-    if ($LASTEXITPR -ne 0) { $currentVer = "unknown" }
+    if (-not $currentVer) { $currentVer = "unknown" }
     Info "tmux is already installed ($currentVer). Skipping installation."
 } else {
     if (-not (Get-Command winget -ErrorAction SilentlyContinue)) {