diff --git a/crates/ra_syntax/Cargo.toml b/crates/ra_syntax/Cargo.toml
index 9bc85404a0..b2d87ba03e 100644
--- a/crates/ra_syntax/Cargo.toml
+++ b/crates/ra_syntax/Cargo.toml
@@ -15,10 +15,6 @@ rustc-hash = "1.0.1"
 arrayvec = "0.4.10"
 once_cell = "1.2.0"
 
-# ideally, `serde` should be enabled by `ra_lsp_server`, but we enable it here
-# to reduce number of compilations
-smol_str = { version = "0.1.12", features = ["serde"] }
-
 ra_text_edit = { path = "../ra_text_edit" }
 ra_parser = { path = "../ra_parser" }
 
diff --git a/crates/ra_tt/Cargo.toml b/crates/ra_tt/Cargo.toml
index 3328d312fa..3fcc7f0855 100644
--- a/crates/ra_tt/Cargo.toml
+++ b/crates/ra_tt/Cargo.toml
@@ -5,4 +5,6 @@ version = "0.1.0"
 authors = ["rust-analyzer developers"]
 
 [dependencies]
-smol_str = "0.1.9"
+# ideally, `serde` should be enabled by `ra_lsp_server`, but we enable it here
+# to reduce number of compilations
+smol_str = { version = "0.1.12", features = ["serde"] }