diff --git a/hash.c b/hash.c
index 0f0ea43144..6f3ffb78ba 100644
--- a/hash.c
+++ b/hash.c
@@ -3608,24 +3608,24 @@ symbol_key_needs_quote(VALUE str)
     if (first == '@' || first == '$' || first == '!') return true;
     if (!at_char_boundary(s, s + len - 1, RSTRING_END(str), rb_enc_get(str))) return false;
     switch (s[len - 1]) {
-        case '+':
-        case '-':
-        case '*':
-        case '/':
-        case '`':
-        case '%':
-        case '^':
-        case '&':
-        case '|':
-        case ']':
-        case '<':
-        case '=':
-        case '>':
-        case '~':
-        case '@':
-            return true;
-        default:
-            return false;
+      case '+':
+      case '-':
+      case '*':
+      case '/':
+      case '`':
+      case '%':
+      case '^':
+      case '&':
+      case '|':
+      case ']':
+      case '<':
+      case '=':
+      case '>':
+      case '~':
+      case '@':
+        return true;
+      default:
+        return false;
     }
 }
 
diff --git a/namespace.c b/namespace.c
index dd7d21c380..e667590890 100644
--- a/namespace.c
+++ b/namespace.c
@@ -596,15 +596,15 @@ static const char *
 copy_ext_file_error(char *message, size_t size, int copy_retvalue, char *src_path, char *dst_path)
 {
     switch (copy_retvalue) {
-    case 1:
+      case 1:
         snprintf(message, size, "can't open the extension path: %s", src_path);
-    case 2:
+      case 2:
         snprintf(message, size, "can't open the file to write: %s", dst_path);
-    case 3:
+      case 3:
         snprintf(message, size, "failed to read the extension path: %s", src_path);
-    case 4:
+      case 4:
         snprintf(message, size, "failed to write the extension path: %s", dst_path);
-    default:
+      default:
         rb_bug("unknown return value of copy_ext_file: %d", copy_retvalue);
     }
     return message;
diff --git a/object.c b/object.c
index 0ab93b7a71..4d54b73740 100644
--- a/object.c
+++ b/object.c
@@ -377,19 +377,19 @@ init_copy(VALUE dest, VALUE obj)
     // Copies the shape id from obj to dest
     RBASIC(dest)->flags |= RBASIC(obj)->flags & T_MASK;
     switch (BUILTIN_TYPE(obj)) {
-        case T_IMEMO:
-          rb_bug("Unreachable");
-          break;
-        case T_CLASS:
-        case T_MODULE:
-          // noop: handled in class.c: rb_mod_init_copy
-          break;
-        case T_OBJECT:
-          rb_obj_copy_ivar(dest, obj);
-          break;
-        default:
-          rb_copy_generic_ivar(dest, obj);
-          break;
+      case T_IMEMO:
+        rb_bug("Unreachable");
+        break;
+      case T_CLASS:
+      case T_MODULE:
+        // noop: handled in class.c: rb_mod_init_copy
+        break;
+      case T_OBJECT:
+        rb_obj_copy_ivar(dest, obj);
+        break;
+      default:
+        rb_copy_generic_ivar(dest, obj);
+        break;
     }
     rb_gc_copy_attributes(dest, obj);
 }