diff --git a/lib/rufo/formatter.rb b/lib/rufo/formatter.rb
index c07ccc42..d564a61c 100644
--- a/lib/rufo/formatter.rb
+++ b/lib/rufo/formatter.rb
@@ -3310,7 +3310,15 @@ def visit_hash_pattern(node)
 
     visit_literal_elements elements, inside_hash: true, token_column: token_column, keep_final_newline: expected_right_token.nil? do |element|
       key, value = element
-      visit key
+
+      if current_token_kind == :on_tstring_beg
+        consume_token :on_tstring_beg
+        visit key
+        consume_token :on_label_end
+      else
+        visit key
+      end
+
       if value
         consume_space
         visit value
diff --git a/spec/lib/rufo/formatter_source_specs/pattern_matching.rb.spec b/spec/lib/rufo/formatter_source_specs/pattern_matching.rb.spec
index e9855928..f0169bc2 100644
--- a/spec/lib/rufo/formatter_source_specs/pattern_matching.rb.spec
+++ b/spec/lib/rufo/formatter_source_specs/pattern_matching.rb.spec
@@ -784,3 +784,15 @@ case x
 in 1..3
   "a"
 end
+
+#~# ORIGINAL issue_312
+case x
+  in {"a": 1}
+    1
+end
+
+#~# EXPECTED
+case x
+in { "a": 1 }
+  1
+end