diff --git a/src/tests/system/libroot/posix/Jamfile b/src/tests/system/libroot/posix/Jamfile
index 2b92ae2ef5..922cc9c5b3 100644
--- a/src/tests/system/libroot/posix/Jamfile
+++ b/src/tests/system/libroot/posix/Jamfile
@@ -68,6 +68,10 @@ SimpleTest xsi_sem_test1
 	: xsi_sem_test1.cpp
 ;
 
+SimpleTest mbtest
+	: mbtest.c
+;
+
 # Tell Jam where to find these sources
 SEARCH on [ FGristFiles
 		syslog.cpp
diff --git a/src/tests/system/libroot/posix/mbtest.c b/src/tests/system/libroot/posix/mbtest.c
new file mode 100755
index 0000000000..1996fec531
--- /dev/null
+++ b/src/tests/system/libroot/posix/mbtest.c
@@ -0,0 +1,12 @@
+#include <locale.h>
+#include <limits.h>
+#include <stdio.h>
+
+int main(int argc, char** argv) {
+	
+	setlocale(LC_CTYPE, "");
+	
+	printf("Len: %i\n", mblen(argv[1], SSIZE_MAX));
+	
+	return 0;
+}