diff --git a/libs/sofia-sip/libsofia-sip-ua/bnf/torture_bnf.c b/libs/sofia-sip/libsofia-sip-ua/bnf/torture_bnf.c
index b2a1b93e72..005455dede 100644
--- a/libs/sofia-sip/libsofia-sip-ua/bnf/torture_bnf.c
+++ b/libs/sofia-sip/libsofia-sip-ua/bnf/torture_bnf.c
@@ -49,7 +49,7 @@ static int test_flags = 0;
 
 char const name[] = "torture_bnf";
 
-int count_bnf(int bnf_flags)
+static int count_bnf(int bnf_flags)
 {
   int i, n;
 
@@ -60,7 +60,7 @@ int count_bnf(int bnf_flags)
   return n;
 }
 
-int bnf_test(void)
+static int bnf_test(void)
 {
   BEGIN();
   TEST_1(IS_TOKEN('a'));
@@ -92,7 +92,7 @@ int bnf_test(void)
   END();
 }
 
-int ip_test(void)
+static int ip_test(void)
 {
   BEGIN();
   char *s;
@@ -249,7 +249,7 @@ int ip_test(void)
 
 #include <sofia-sip/hostdomain.h>
 
-int host_test(void)
+static int host_test(void)
 {
   BEGIN();
 
@@ -347,7 +347,7 @@ int host_test(void)
   END();
 }
 
-void usage(int exitcode)
+static void usage(int exitcode)
 {
   fprintf(stderr, "usage: %s [-v] [-a]\n", name);
   exit(exitcode);