diff --git a/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server/token_stream.rs b/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server/token_stream.rs
index 7de30e73928..d091d431900 100644
--- a/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server/token_stream.rs
+++ b/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server/token_stream.rs
@@ -65,7 +65,7 @@ fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) {
             for tkn in item {
                 match tkn {
                     tt::TokenTree::Subtree(subtree)
-                        if subtree.delimiter.kind != tt::DelimiterKind::Invisible =>
+                        if subtree.delimiter.kind == tt::DelimiterKind::Invisible =>
                     {
                         self.token_trees.extend(subtree.token_trees);
                     }