diff --git a/inc/utils.h b/inc/utils.h
index a18e6bb..3b90e3f 100644
--- a/inc/utils.h
+++ b/inc/utils.h
@@ -18,7 +18,3 @@ int set_params(rfc3161_context *ct, char *conf_file, char *conf_wd);
 static char *rand_string(char *str, size_t size);
 void free_uts_context(rfc3161_context *ct);
 const char *null_undef(const char *in);
-
-// some global variable to handle signals
-int g_uts_sig_up;
-int g_uts_sig;
diff --git a/src/lib/http.c b/src/lib/http.c
index 60c2915..ea402e9 100644
--- a/src/lib/http.c
+++ b/src/lib/http.c
@@ -9,6 +9,9 @@
 #include <time.h>
 #include <unistd.h>
 
+extern int g_uts_sig_up;
+extern int g_uts_sig;
+
 static char *rand_string(char *str, size_t size) {
     const char charset[] = "1234567890ABCDEF";
     if (size) {
diff --git a/src/lib/rfc3161.c b/src/lib/rfc3161.c
index e8b6865..3cf0cb2 100644
--- a/src/lib/rfc3161.c
+++ b/src/lib/rfc3161.c
@@ -269,7 +269,7 @@ end:
         BN_free(serial_bn);
     } else {
         serial_hex = calloc(SERIAL_ID_SIZE, sizeof(char));
-        strncpy(serial_hex, " NO ID   ", SERIAL_ID_SIZE + 2);
+        strncpy(serial_hex, " NO ID   ", SERIAL_ID_SIZE + 4);
     }
 #endif
 #ifdef OPENSSL_API_1_0
diff --git a/src/lib/utils.c b/src/lib/utils.c
index cb18d66..5543c5b 100644
--- a/src/lib/utils.c
+++ b/src/lib/utils.c
@@ -12,6 +12,10 @@
 #include <syslog.h>
 #include <unistd.h>
 
+// some global variable to handle signals
+int g_uts_sig_up;
+int g_uts_sig;
+
 static void signal_handler_general(int sig_num) {
     g_uts_sig = sig_num;
 }