diff --git a/martin-tile-utils/src/lib.rs b/martin-tile-utils/src/lib.rs
index 9df4fd498..43b7705a1 100644
--- a/martin-tile-utils/src/lib.rs
+++ b/martin-tile-utils/src/lib.rs
@@ -75,14 +75,14 @@ impl Format {
 
 impl Display for Format {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match *self {
-            Self::Gif => write!(f, "gif"),
-            Self::Jpeg => write!(f, "jpeg"),
-            Self::Json => write!(f, "json"),
-            Self::Mvt => write!(f, "mvt"),
-            Self::Png => write!(f, "png"),
-            Self::Webp => write!(f, "webp"),
-        }
+        f.write_str(match *self {
+            Self::Gif => "gif",
+            Self::Jpeg => "jpeg",
+            Self::Json => "json",
+            Self::Mvt => "mvt",
+            Self::Png => "png",
+            Self::Webp => "webp",
+        })
     }
 }
 
@@ -194,7 +194,7 @@ impl Display for TileInfo {
         if let Some(encoding) = self.encoding.content_encoding() {
             write!(f, "; encoding={encoding}")?;
         } else if self.encoding != Encoding::Uncompressed {
-            write!(f, "; uncompressed")?;
+            f.write_str("; uncompressed")?;
         }
         Ok(())
     }
diff --git a/martin/src/bin/martin-cp.rs b/martin/src/bin/martin-cp.rs
index d24031ea9..35c75d6ce 100644
--- a/martin/src/bin/martin-cp.rs
+++ b/martin/src/bin/martin-cp.rs
@@ -253,9 +253,9 @@ impl Display for Progress {
 
         let left = self.total - done;
         if left == 0 {
-            write!(f, " | done")
+            f.write_str(" | done")
         } else if done == 0 {
-            write!(f, " | ??? left")
+            f.write_str(" | ??? left")
         } else {
             let left = Duration::from_secs_f32(elapsed_s * left as f32 / done as f32);
             write!(f, " | {left:.0?} left")
diff --git a/martin/src/pg/query_functions.rs b/martin/src/pg/query_functions.rs
index f1ec01a99..898cbdf09 100644
--- a/martin/src/pg/query_functions.rs
+++ b/martin/src/pg/query_functions.rs
@@ -70,13 +70,13 @@ pub async fn query_available_function(pool: &PgPool) -> PgResult<SqlFuncInfoMapM
             query.push('(');
             for (idx, (_name, typ)) in zip(input_names.iter(), input_types.iter()).enumerate() {
                 if idx > 0 {
-                    write!(query, ", ").unwrap();
+                    query.push_str(", ");
                 }
                 // This could also be done as "{name} => ${index}::{typ}"
                 // where the name must be passed through escape_identifier
                 write!(query, "${index}::{typ}", index = idx + 1).unwrap();
             }
-            write!(query, ")").unwrap();
+            query.push(')');
 
             // TODO: Rewrite as a if-let chain:  if Some(names) = output_record_names && output_type == "record" { ... }
             let ret_inf = if let (Some(names), "record") = (output_record_names, output_type.as_str()) {