diff --git a/libc/bionic/fdsan.cpp b/libc/bionic/fdsan.cpp
index f7f4d31..6433b59 100644
--- a/libc/bionic/fdsan.cpp
+++ b/libc/bionic/fdsan.cpp
@@ -101,7 +101,7 @@
   }
 
   size_t offset = idx - inline_fds;
-  if (local_overflow->len < offset) {
+  if (local_overflow->len <= offset) {
     return nullptr;
   }
   return &local_overflow->entries[offset];