diff --git a/rustdev.nix b/rustdev.nix
index bbaf173..802befc 100644
--- a/rustdev.nix
+++ b/rustdev.nix
@@ -16,7 +16,9 @@
   home.file = {
     ".zfunc/_cargo".text = ''
       #compdef cargo
-      	source $(rustc --print sysroot)/share/zsh/site-functions/_cargo
+      if command -v rustc >/dev/null 2>&1; then
+      	source "$(rustc --print sysroot)"/share/zsh/site-functions/_cargo
+      fi
     '';
   };
 }