diff --git a/tests/gsm0408/gsm0408_test.c b/tests/gsm0408/gsm0408_test.c
index 77a8822..ab2dee4 100644
--- a/tests/gsm0408/gsm0408_test.c
+++ b/tests/gsm0408/gsm0408_test.c
@@ -194,10 +194,23 @@
 	printf("passed\n");
 }
 
+static void test_mid_from_imsi(void)
+{
+	char *imsi = "901700000004620";
+	uint8_t buf[10], len;
+
+	printf("Simple IMSI encoding test....");
+
+	len = gsm48_generate_mid_from_imsi(buf, imsi);
+
+	printf("passed: [%u] %s\n", len, osmo_hexdump(buf, len));
+}
+
 int main(int argc, char **argv)
 {
 	test_bearer_cap();
 	test_mid_from_tmsi();
+	test_mid_from_imsi();
 	test_ra_cap();
 
 	return EXIT_SUCCESS;
diff --git a/tests/gsm0408/gsm0408_test.ok b/tests/gsm0408/gsm0408_test.ok
index 83165fa..76a7940 100644
--- a/tests/gsm0408/gsm0408_test.ok
+++ b/tests/gsm0408/gsm0408_test.ok
@@ -1,6 +1,7 @@
 Test `CSD 9600/V.110/transparent' passed
 Test `Speech, all codecs' passed
 Simple TMSI encoding test....passed
+Simple IMSI encoding test....passed: [10] 17 08 99 10 07 00 00 00 64 02 
 Constructed RA:
 RA: MNC=121, MCC=77, LAC=666, RAC=5
 RA: MNC=121, MCC=77, LAC=666, RAC=5