diff --git a/fuzz/corpus/fuzz_filecfg_protocols/domain.txt b/fuzz/corpus/fuzz_filecfg_protocols/domain.txt
new file mode 100644
index 00000000000..b2101c8dba4
--- /dev/null
+++ b/fuzz/corpus/fuzz_filecfg_protocols/domain.txt
@@ -0,0 +1 @@
+ip:www.ntop.org@ntop
diff --git a/fuzz/corpus/fuzz_filecfg_protocols/domain_ipv6.txt b/fuzz/corpus/fuzz_filecfg_protocols/domain_ipv6.txt
new file mode 100644
index 00000000000..232d57d02f2
--- /dev/null
+++ b/fuzz/corpus/fuzz_filecfg_protocols/domain_ipv6.txt
@@ -0,0 +1 @@
+ipv6:www.ntop.org@ntop
diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 5b00c8491d0..b14297c16fd 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -2768,7 +2768,7 @@ static int ndpi_add_host_ip_subprotocol(struct ndpi_detection_module_struct *ndp
     /* Check if the IP address is symbolic or numeric */
     unsigned int d[4];
     char tail[16] = { '\0' };
-    int c = sscanf(value, "%3u.%3u.%3u.%3u%s", &d[0], &d[1], &d[2], &d[3], tail);
+    int c = sscanf(value, "%3u.%3u.%3u.%3u%15s", &d[0], &d[1], &d[2], &d[3], tail);
 
     if ((c != 4) || tail[0]) {
       /* This might be a symbolic IPv4 address */