diff --git a/src/atomic-xr/oscavmgr.nu b/src/atomic-xr/oscavmgr.nu
index 0e48e9d..9915452 100644
--- a/src/atomic-xr/oscavmgr.nu
+++ b/src/atomic-xr/oscavmgr.nu
@@ -7,5 +7,12 @@ const self = path self .
 export def start [
     module: string # babble, openxr (WiVRn), alvr
 ] {
-    run-external ($self | path join 'bin' 'oscavmgr-launch.sh')
+    if (which oscavmgr | length) == 0 or (which VrcAdvert | length) == 0 {
+        error make -u {
+            msg: "OscAvMgr and VrcAdvert are not installed"
+            help: "Use `brew install oscavmgr vrc-advert` to install them"
+        }
+    }
+
+    exec ($self | path join 'bin' 'oscavmgr-launch.sh') $module
 }