diff --git a/src/nxt_application.c b/src/nxt_application.c
index 62167040..834badf9 100644
--- a/src/nxt_application.c
+++ b/src/nxt_application.c
@@ -289,7 +289,7 @@ nxt_discovery_modules(nxt_task_t *task, const char *path)
 
     *p++ = ']';
 
-    if (nxt_slow_path(p >= end)) {
+    if (nxt_slow_path(p > end)) {
         nxt_alert(task, "discovery write past the buffer");
         goto fail;
     }