diff --git a/repos/libports/include/stdcxx/bits/c++config.h b/repos/libports/include/stdcxx/bits/c++config.h
index d02627ef8e..9740ba31c3 100644
--- a/repos/libports/include/stdcxx/bits/c++config.h
+++ b/repos/libports/include/stdcxx/bits/c++config.h
@@ -1361,7 +1361,7 @@ namespace std
 
 /* Define if C99 functions or macros in <stdlib.h> should be imported in
    <cstdlib> in namespace std for C++11. */
-/* #undef _GLIBCXX11_USE_C99_STDLIB */
+#define _GLIBCXX11_USE_C99_STDLIB 1
 
 /* Define if C99 functions or macros in <wchar.h> should be imported in
    <cwchar> in namespace std for C++11. */
diff --git a/repos/libports/run/stdcxx.run b/repos/libports/run/stdcxx.run
index 355be08098..a1e151af62 100644
--- a/repos/libports/run/stdcxx.run
+++ b/repos/libports/run/stdcxx.run
@@ -34,3 +34,16 @@ build_boot_image {
 append qemu_args " -nographic  "
 
 run_genode_until ".*test-stdcxx finished.*\n" 20
+
+grep_output {^\[init }
+
+compare_output_to {
+[init -> test-stdcxx] ° °° °°° test-stdcxx started °°° °° °
+[init -> test-stdcxx] 2015.000000 - 5.000000 - 4
+[init -> test-stdcxx] 2015 - 5 - 4
+[init -> test-stdcxx] 123
+[init -> test-stdcxx] 456
+[init -> test-stdcxx] 7.8
+[init -> test-stdcxx] caught std::invalid_argument
+[init -> test-stdcxx] ° °° °°° test-stdcxx finished °°° °° °
+}
diff --git a/repos/libports/src/test/stdcxx/main.cc b/repos/libports/src/test/stdcxx/main.cc
index aa02f35bb4..49b2281c54 100644
--- a/repos/libports/src/test/stdcxx/main.cc
+++ b/repos/libports/src/test/stdcxx/main.cc
@@ -48,6 +48,8 @@ static void test_cstdlib()
 {
 	static ::lldiv_t o __attribute__((used));
 	std::cout << std::strtoul("123", 0, 10) << std::endl;
+	std::cout << std::stoi("456") << std::endl;
+	std::cout << std::stod("7.8") << std::endl;
 }