diff --git a/compiler/fmt/src/module.rs b/compiler/fmt/src/module.rs
index 52f6804528..c5ea767c0d 100644
--- a/compiler/fmt/src/module.rs
+++ b/compiler/fmt/src/module.rs
@@ -184,7 +184,7 @@ fn fmt_typed_ident<'a>(buf: &mut Buf<'a>, entry: &TypedIdent<'a>, indent: u16) {
             buf.indent(indent);
             buf.push_str(ident.value);
             fmt_default_spaces(buf, spaces_before_colon, " ", indent);
-            buf.push(':');
+            buf.push_str(": ");
             ann.value.format(buf, indent);
         }
         SpaceBefore(sub_entry, spaces) => {
diff --git a/compiler/fmt/tests/test_fmt.rs b/compiler/fmt/tests/test_fmt.rs
index 6adbed8ee3..9e036a0d0f 100644
--- a/compiler/fmt/tests/test_fmt.rs
+++ b/compiler/fmt/tests/test_fmt.rs
@@ -2620,24 +2620,18 @@ mod test_fmt {
 
     #[test]
     fn single_line_platform() {
-        // There are many places that there should probably be spaces, e.g.:
-        // requires { model=>Model, msg=>Msg } { main : Effect {} }
-        //                                             ^
-        // putLine : Str -> Effect {},
-        //          ^
-        // TODO: improve spacing
         module_formats_same(
             "platform folkertdev/foo \
-            requires { model=>Model, msg=>Msg } { main :Effect {} } \
+            requires { model=>Model, msg=>Msg } { main : Effect {} } \
             exposes [] \
             packages {} \
             imports [ Task.{ Task } ] \
             provides [ mainForHost ] \
             effects fx.Effect \
             { \
-                putLine :Str -> Effect {}, \
-                putInt :I64 -> Effect {}, \
-                getInt :Effect { value : I64, errorCode : [ A, B ], isError : Bool } \
+                putLine : Str -> Effect {}, \
+                putInt : I64 -> Effect {}, \
+                getInt : Effect { value : I64, errorCode : [ A, B ], isError : Bool } \
             } ",
         );
     }