diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index a49900e..46c4931 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -463,7 +463,7 @@
 	uint8_t *m_rand, *m_cksn;
 
 	DEBUGP(DMM, "<- GPRS AUTH AND CIPHERING REQ (rand = %s)\n",
-		hexdump(rand, 16));
+		osmo_hexdump(rand, 16));
 
 	mmctx2msgid(msg, mm);