diff --git a/include/regex b/include/regex
index b9dac4765..ca455f0ce 100644
--- a/include/regex
+++ b/include/regex
@@ -4265,6 +4265,9 @@ basic_regex<_CharT, _Traits>::__parse_atom_escape(_ForwardIterator __first,
     if (__first != __last && *__first == '\\')
     {
         _ForwardIterator __t1 = _VSTD::next(__first);
+        if (__t1 == __last)
+            __throw_regex_error<regex_constants::error_escape>();
+
         _ForwardIterator __t2 = __parse_decimal_escape(__t1, __last);
         if (__t2 != __t1)
             __first = __t2;
diff --git a/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp b/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
index 4da4d957a..9459cd74c 100644
--- a/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
+++ b/test/std/re/re.regex/re.regex.construct/bad_escape.pass.cpp
@@ -33,6 +33,7 @@ int main()
 {
     assert(error_escape_thrown("[\\a]"));
     assert(error_escape_thrown("\\a"));
+    assert(error_escape_thrown("\\"));
 
     assert(error_escape_thrown("[\\e]"));
     assert(error_escape_thrown("\\e"));