diff --git a/src/libcharon/plugins/vici/vici_socket.c b/src/libcharon/plugins/vici/vici_socket.c
index 1016633ab..9b897cb0a 100644
--- a/src/libcharon/plugins/vici/vici_socket.c
+++ b/src/libcharon/plugins/vici/vici_socket.c
@@ -728,7 +728,8 @@ vici_socket_t *vici_socket_create(char *uri, vici_inbound_cb_t inbound,
 		.user = user,
 	);
 
-	this->service = lib->streams->create_service(lib->streams, uri, 3);
+	this->service = lib->streams->create_service(lib->streams, uri,
+												 VICI_SOCKET_BACKLOG);
 	if (!this->service)
 	{
 		DBG1(DBG_CFG, "creating vici socket failed");
diff --git a/src/libcharon/plugins/vici/vici_socket.h b/src/libcharon/plugins/vici/vici_socket.h
index 82cb8f2f2..b7c2ea8f0 100644
--- a/src/libcharon/plugins/vici/vici_socket.h
+++ b/src/libcharon/plugins/vici/vici_socket.h
@@ -31,6 +31,13 @@
 #define VICI_MESSAGE_SIZE_MAX (512 * 1024)
 #endif
 
+/**
+ * Maximum number of pending connections.
+ */
+#ifndef VICI_SOCKET_BACKLOG
+#define VICI_SOCKET_BACKLOG 3
+#endif
+
 typedef struct vici_socket_t vici_socket_t;
 
 /**