diff --git a/include/system_error b/include/system_error
index a29807db0..12745525f 100644
--- a/include/system_error
+++ b/include/system_error
@@ -230,6 +230,7 @@ template <> struct hash<std::error_condition>;
 #include <type_traits>
 #include <stdexcept>
 #include <__functional_base>
+#include <string>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
diff --git a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/nothing_to_do.pass.cpp b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/types.pass.cpp
similarity index 52%
rename from test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/nothing_to_do.pass.cpp
rename to test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/types.pass.cpp
index b58f5c55b..a2515a4c8 100644
--- a/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/types.pass.cpp
@@ -7,6 +7,17 @@
 //
 //===----------------------------------------------------------------------===//
 
+// <system_error>
+// class error_code
+
+// Make sure that the error_code bits of <system_error> are self-contained.
+
+#include <system_error>
+
 int main()
 {
+    std::error_code x;
+    (void) x.category();   // returns a std::error_category &
+    (void) x.default_error_condition(); // std::error_condition
+    (void) x.message();    // returns a std::string
 }
diff --git a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/nothing_to_do.pass.cpp b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/types.pass.cpp
similarity index 54%
rename from test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/nothing_to_do.pass.cpp
rename to test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/types.pass.cpp
index b58f5c55b..5bbca295f 100644
--- a/test/std/diagnostics/syserr/syserr.errcode/syserr.errcode.overview/nothing_to_do.pass.cpp
+++ b/test/std/diagnostics/syserr/syserr.errcondition/syserr.errcondition.overview/types.pass.cpp
@@ -7,6 +7,16 @@
 //
 //===----------------------------------------------------------------------===//
 
+// <system_error>
+// class error_condition
+
+// Make sure that the error_condition bits of <system_error> are self-contained.
+
+#include <system_error>
+
 int main()
 {
+    std::error_condition x = std::errc(0);
+    (void) x.category();   // returns a std::error_condition &
+    (void) x.message();    // returns a std::string
 }