diff --git a/libs/srtp/crypto/rng/prng.c b/libs/srtp/crypto/rng/prng.c
index 23130be258..0cd027eece 100644
--- a/libs/srtp/crypto/rng/prng.c
+++ b/libs/srtp/crypto/rng/prng.c
@@ -47,7 +47,7 @@
 
 /* single, global prng structure */
 
-x917_prng_t x917_prng;
+static x917_prng_t x917_prng;
 
 err_status_t
 x917_prng_init(rand_source_func_t random_source) {