diff --git a/plugins/rust/rust.plugin.zsh b/plugins/rust/rust.plugin.zsh
index 465b701b0..db6ca9e74 100644
--- a/plugins/rust/rust.plugin.zsh
+++ b/plugins/rust/rust.plugin.zsh
@@ -27,5 +27,5 @@ fi
 rustup completions zsh >| "$ZSH_CACHE_DIR/completions/_rustup" &|
 cat >| "$ZSH_CACHE_DIR/completions/_cargo" <<'EOF'
 #compdef cargo
-source $(rustc +${${(z)$(rustup default)}[1]} --print sysroot)/share/zsh/site-functions/_cargo
+source "$(rustc +${${(z)$(rustup default)}[1]} --print sysroot)"/share/zsh/site-functions/_cargo
 EOF