3 files changed, 11 insertions, 3 deletions
diff --git a/string.c b/string.c
index dcb28532cd..855d594b84 100644
--- a/string.c
+++ b/string.c
@@ -657,12 +657,13 @@ rb_enc_str_coderange(VALUE str)
     if (cr == ENC_CODERANGE_UNKNOWN) {
 	int encidx = ENCODING_GET(str);
 	rb_encoding *enc = rb_enc_from_index(encidx);
-	if (rb_enc_mbminlen(enc) > 1 && rb_enc_dummy_p(enc)) {
+	if (rb_enc_mbminlen(enc) > 1 && rb_enc_dummy_p(enc) &&
+            rb_enc_mbminlen(enc = get_actual_encoding(encidx, str)) == 1) {
 	    cr = ENC_CODERANGE_BROKEN;
 	}
 	else {
 	    cr = coderange_scan(RSTRING_PTR(str), RSTRING_LEN(str),
-				get_actual_encoding(encidx, str));
+                                enc);
 	}
         ENC_CODERANGE_SET(str, cr);
     }
diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index c1184c551f..75daf61376 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -269,6 +269,13 @@ class TestM17N < Test::Unit::TestCase
     assert_empty(encs, bug10598)
   end
 
+  def test_utf_without_bom_valid
+    encs = [Encoding::UTF_16, Encoding::UTF_32].find_all {|enc|
+      !(+"abcd").encode!(enc).force_encoding(enc).valid_encoding?
+    }
+    assert_empty(encs)
+  end
+
   def test_object_utf16_32_inspect
     EnvUtil.suppress_warning do
       begin
diff --git a/version.h b/version.h
index c41e17c928..07b8633de0 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.6.1"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 38
+#define RUBY_PATCHLEVEL 39
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 3