diff --git a/postgres-types/Cargo.toml b/postgres-types/Cargo.toml
index d8464186..70f1ed54 100644
--- a/postgres-types/Cargo.toml
+++ b/postgres-types/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "postgres-types"
-version = "0.2.3"
+version = "0.2.4"
 authors = ["Steven Fackler <sfackler@gmail.com>"]
 edition = "2018"
 license = "MIT/Apache-2.0"
@@ -21,6 +21,7 @@ with-eui48-1 = ["eui48-1"]
 with-geo-types-0_6 = ["geo-types-06"]
 with-geo-types-0_7 = ["geo-types-0_7"]
 with-serde_json-1 = ["serde-1", "serde_json-1"]
+with-smol_str-01 = ["smol_str-01"]
 with-uuid-0_8 = ["uuid-08"]
 with-uuid-1 = ["uuid-1"]
 with-time-0_2 = ["time-02"]
@@ -48,5 +49,4 @@ uuid-08 = { version = "0.8", package = "uuid", optional = true }
 uuid-1 = { version = "1.0", package = "uuid", optional = true }
 time-02 = { version = "0.2", package = "time", optional = true }
 time-03 = { version = "0.3", package = "time", default-features = false, optional = true }
-
 smol_str-01 = { version = "0.1.23", package = "smol_str", default-features = false, optional = true }
diff --git a/postgres-types/src/lib.rs b/postgres-types/src/lib.rs
index 5c5a0d02..f5d841cd 100644
--- a/postgres-types/src/lib.rs
+++ b/postgres-types/src/lib.rs
@@ -224,7 +224,7 @@ mod geo_types_06;
 mod geo_types_07;
 #[cfg(feature = "with-serde_json-1")]
 mod serde_json_1;
-#[cfg(feature = "smol_str-01")]
+#[cfg(feature = "with-smol_str-01")]
 mod smol_str_01;
 #[cfg(feature = "with-time-0_2")]
 mod time_02;
diff --git a/postgres/Cargo.toml b/postgres/Cargo.toml
index 15b1b32e..b7f0e2ca 100644
--- a/postgres/Cargo.toml
+++ b/postgres/Cargo.toml
@@ -29,6 +29,7 @@ with-eui48-1 = ["tokio-postgres/with-eui48-1"]
 with-geo-types-0_6 = ["tokio-postgres/with-geo-types-0_6"]
 with-geo-types-0_7 = ["tokio-postgres/with-geo-types-0_7"]
 with-serde_json-1 = ["tokio-postgres/with-serde_json-1"]
+with-smol_str-01 = ["tokio-postgres/with-smol_str-01"]
 with-uuid-0_8 = ["tokio-postgres/with-uuid-0_8"]
 with-uuid-1 = ["tokio-postgres/with-uuid-1"]
 with-time-0_2 = ["tokio-postgres/with-time-0_2"]
diff --git a/tokio-postgres/Cargo.toml b/tokio-postgres/Cargo.toml
index 57af5676..b2190c9a 100644
--- a/tokio-postgres/Cargo.toml
+++ b/tokio-postgres/Cargo.toml
@@ -35,6 +35,7 @@ with-eui48-1 = ["postgres-types/with-eui48-1"]
 with-geo-types-0_6 = ["postgres-types/with-geo-types-0_6"]
 with-geo-types-0_7 = ["postgres-types/with-geo-types-0_7"]
 with-serde_json-1 = ["postgres-types/with-serde_json-1"]
+with-smol_str-01 = ["postgres-types/with-smol_str-01"]
 with-uuid-0_8 = ["postgres-types/with-uuid-0_8"]
 with-uuid-1 = ["postgres-types/with-uuid-1"]
 with-time-0_2 = ["postgres-types/with-time-0_2"]
@@ -62,7 +63,13 @@ tokio-util = { version = "0.7", features = ["codec"] }
 futures-executor = "0.3"
 criterion = "0.3"
 env_logger = "0.9"
-tokio = { version = "1.0", features = ["macros", "net", "rt", "rt-multi-thread", "time"] }
+tokio = { version = "1.0", features = [
+    "macros",
+    "net",
+    "rt",
+    "rt-multi-thread",
+    "time",
+] }
 
 bit-vec-06 = { version = "0.6", package = "bit-vec" }
 chrono-04 = { version = "0.4", package = "chrono", default-features = false }
@@ -72,6 +79,7 @@ geo-types-06 = { version = "0.6", package = "geo-types" }
 geo-types-07 = { version = "0.7", package = "geo-types" }
 serde-1 = { version = "1.0", package = "serde" }
 serde_json-1 = { version = "1.0", package = "serde_json" }
+smol_str-01 = { version = "0.1", package = "smol_str" }
 uuid-08 = { version = "0.8", package = "uuid" }
 uuid-1 = { version = "1.0", package = "uuid" }
 time-02 = { version = "0.2", package = "time" }
diff --git a/tokio-postgres/tests/test/types/mod.rs b/tokio-postgres/tests/test/types/mod.rs
index e3fd663a..452d149f 100644
--- a/tokio-postgres/tests/test/types/mod.rs
+++ b/tokio-postgres/tests/test/types/mod.rs
@@ -27,6 +27,8 @@ mod geo_types_06;
 mod geo_types_07;
 #[cfg(feature = "with-serde_json-1")]
 mod serde_json_1;
+#[cfg(feature = "with-smol_str-01")]
+mod smol_str_01;
 #[cfg(feature = "with-time-0_2")]
 mod time_02;
 #[cfg(feature = "with-time-0_3")]
diff --git a/tokio-postgres/tests/test/types/smol_str_01.rs b/tokio-postgres/tests/test/types/smol_str_01.rs
new file mode 100644
index 00000000..843d486b
--- /dev/null
+++ b/tokio-postgres/tests/test/types/smol_str_01.rs
@@ -0,0 +1,18 @@
+use smol_str_01::SmolStr;
+
+use crate::types::test_type;
+
+#[tokio::test]
+async fn test_smol_str() {
+    test_type(
+        "VARCHAR",
+        &[
+            (Some(SmolStr::new("hello world")), "'hello world'"),
+            (
+                Some(SmolStr::new("イロハニホヘト チリヌルヲ")),
+                "'イロハニホヘト チリヌルヲ'",
+            ),
+            (None, "NULL"),
+        ]
+    ).await;
+}