diff --git a/lld/MachO/InputFiles.cpp b/lld/MachO/InputFiles.cpp
--- a/lld/MachO/InputFiles.cpp
+++ b/lld/MachO/InputFiles.cpp
@@ -329,14 +329,14 @@
                                                     : buf + sec.offset,
                               static_cast<size_t>(sec.size)};
 
-    auto splitRecords = [&](int recordSize) -> void {
+    auto splitRecords = [&](size_t recordSize) -> void {
       if (data.empty())
         return;
       Subsections &subsections = section.subsections;
       subsections.reserve(data.size() / recordSize);
       for (uint64_t off = 0; off < data.size(); off += recordSize) {
         auto *isec = make<ConcatInputSection>(
-            section, data.slice(off, recordSize), align);
+            section, data.slice(off, std::min(data.size(), recordSize)), align);
         subsections.push_back({off, isec});
       }
       section.doneSplitting = true;