diff -r -u libsrtp-2.3.0.orig/test/util.c libsrtp-2.3.0/test/util.c
--- libsrtp-2.3.0.orig/test/util.c	2019-12-23 10:58:25.000000000 +0100
+++ libsrtp-2.3.0/test/util.c	2020-10-09 11:56:31.455502870 +0200
@@ -49,7 +49,7 @@
 #include <stdint.h>
 
 /* include space for null terminator */
-char bit_string[MAX_PRINT_STRING_LEN + 1];
+static char bit_string[MAX_PRINT_STRING_LEN + 1];
 
 static inline int hex_char_to_nibble(uint8_t c)
 {