diff --git a/tests/gbproxy/gbproxy_test.c b/tests/gbproxy/gbproxy_test.c
index e8a4ef9..3ebdccb 100644
--- a/tests/gbproxy/gbproxy_test.c
+++ b/tests/gbproxy/gbproxy_test.c
@@ -37,8 +37,6 @@
 #include <osmocom/sgsn/gprs_gb_parse.h>
 #include <osmocom/sgsn/debug.h>
 
-#include <openssl/rand.h>
-
 #define REMOTE_BSS_ADDR 0x01020304
 #define REMOTE_SGSN_ADDR 0x05060708
 
@@ -55,24 +53,23 @@
 
 struct llist_head *received_messages = NULL;
 
-/* override, requires '-Wl,--wrap=RAND_bytes' */
-int __real_RAND_bytes(unsigned char *buf, int num);
-int mock_RAND_bytes(unsigned char *buf, int num);
-int (*RAND_bytes_cb)(unsigned char *, int) =
-  &mock_RAND_bytes;
+/* override, requires '-Wl,--wrap=osmo_get_rand_id' */
+int __real_osmo_get_rand_id(uint8_t *data, size_t len);
+int mock_osmo_get_rand_id(uint8_t *data, size_t len);
+int (*osmo_get_rand_id_cb)(uint8_t *, size_t) =
+  &mock_osmo_get_rand_id;
 
-int __wrap_RAND_bytes(unsigned char *buf, int num)
+int __wrap_osmo_get_rand_id(uint8_t *buf, size_t num)
 {
-	return (*RAND_bytes_cb)(buf, num);
+	return (*osmo_get_rand_id_cb)(buf, num);
 }
 
 static int rand_seq_num = 0;
-int mock_RAND_bytes(unsigned char *buf, int num)
+int mock_osmo_get_rand_id(uint8_t *buf, size_t num)
 {
 	uint32_t val;
 
 	OSMO_ASSERT(num == sizeof(val));
-	OSMO_ASSERT(__real_RAND_bytes(buf, num) == 1);
 
 	val = 0x00dead00 + rand_seq_num;