diff --git a/lib/rufo/formatter.rb b/lib/rufo/formatter.rb
index 35305203..d37d2d5b 100644
--- a/lib/rufo/formatter.rb
+++ b/lib/rufo/formatter.rb
@@ -2147,10 +2147,11 @@ def visit_params(node)
         # [:@label, "b:", [1, 20]]
         write label[1]
         next_token
-        skip_space_or_newline
         if value
           consume_space
           visit value
+        else
+          skip_space
         end
       end
       needs_comma = true
diff --git a/spec/lib/rufo/formatter_source_specs/3.1/method_definition_with_receiver.rb.spec b/spec/lib/rufo/formatter_source_specs/3.1/method_definition_with_receiver.rb.spec
new file mode 100644
index 00000000..8e60ac04
--- /dev/null
+++ b/spec/lib/rufo/formatter_source_specs/3.1/method_definition_with_receiver.rb.spec
@@ -0,0 +1,14 @@
+#~# ORIGINAL issue_331
+#~# parens_in_def: :dynamic
+class User
+  def self.by_uid uid:
+    joins(:authentications).where(authentications: { uid: }).first
+  end
+end
+
+#~# EXPECTED
+class User
+  def self.by_uid uid:
+    joins(:authentications).where(authentications: { uid: }).first
+  end
+end
diff --git a/spec/lib/rufo/formatter_source_specs/method_definition.rb.spec b/spec/lib/rufo/formatter_source_specs/method_definition.rb.spec
index c0d995be..bdf487f8 100644
--- a/spec/lib/rufo/formatter_source_specs/method_definition.rb.spec
+++ b/spec/lib/rufo/formatter_source_specs/method_definition.rb.spec
@@ -371,3 +371,13 @@ end
 def foo(a, ...)
   p(...)
 end
+
+#~# ORIGINAL issue_331
+def foo a:
+  a
+end
+
+#~# EXPECTED
+def foo(a:)
+  a
+end