diff --git a/src/tests/system/libroot/posix/test_confstr.c b/src/tests/system/libroot/posix/test_confstr.c
new file mode 100644
index 0000000000..358d3083eb
--- /dev/null
+++ b/src/tests/system/libroot/posix/test_confstr.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+
+size_t confstr(int name, char *buf, size_t len);
+char string[512];
+
+int main()
+{
+	int i;
+	size_t size;
+	for (i=0; i<INT_MAX; i++) {
+		size = confstr(i, NULL, (size_t) 0);
+		if (errno != B_BAD_VALUE)
+			printf("%ld confstr %ld %s\n", i, size, strerror(errno));
+		if (size != 0) {
+			size = confstr(i, string, sizeof(string));
+			printf("%ld value %s\n", i, string);
+		}
+	}
+}
+