diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -2579,9 +2579,21 @@
   //
   // With this the symbol table should be complete. After this, no new names
   // except a few linker-synthesized ones will be added to the symbol table.
+  const size_t numFilesBeforeLTO = files.size();
   const size_t numObjsBeforeLTO = objectFiles.size();
   invokeELFT(compileBitcodeFiles, skipLinkedOutput);
 
+  // Adding the LTO object file to the link may have added additional input
+  // files to the link, e.g. if a builtin libcall was resolved using an object
+  // file with deplibs.
+  {
+    llvm::TimeTraceScope timeScope("Parse input files");
+    for (size_t i = numFilesBeforeLTO; i < files.size(); ++i) {
+      llvm::TimeTraceScope timeScope("Parse input files", files[i]->getName());
+      parseFile(files[i]);
+    }
+  }
+
   // Symbol resolution finished. Report backward reference problems,
   // --print-archive-stats=, and --why-extract=.
   reportBackrefs();
diff --git a/lld/test/ELF/deplibs-lto.s b/lld/test/ELF/deplibs-lto.s
new file mode 100644
--- /dev/null
+++ b/lld/test/ELF/deplibs-lto.s
@@ -0,0 +1,42 @@
+# REQUIRES: aarch64
+
+# RUN: rm -rf %t.inputs %t.dir
+# RUN: mkdir -p %t.inputs %t.dir
+# RUN: split-file %s %t.inputs
+# RUN: llvm-mc -filetype=obj -triple=aarch64 %t.inputs/deplibs.s -o %tdeplibs.o
+# RUN: llvm-mc -filetype=obj -triple=aarch64 %t.inputs/foo.s -o %tfoo.o
+# RUN: llvm-as %t.inputs/lto.ll -o %t.o
+# RUN: llvm-ar rc %t.dir/libdeplibs.a %tdeplibs.o
+# RUN: llvm-ar rc %t.dir/libfoo.a %tfoo.o
+
+# LTO can emit libcalls that are resolved using libraries that contain .deplibs.
+# Such libraries must be handled as if they were input files, and any referenced
+# deplibs must be added to the link. Otherwise, symbols in the library may go
+# undefined.
+
+# RUN: ld.lld %t.o -u a -o /dev/null -L %t.dir -ldeplibs --trace 2>&1 | \
+# RUN:   FileCheck %s -DOBJ=%t.o -DDIR=%t.dir --check-prefix=LIBA-DIR
+
+# LIBA-DIR:      [[OBJ]]
+# LIBA-DIR-NEXT: [[DIR]]{{[\\/]}}libdeplibs.a
+# LIBA-DIR-NEXT: [[DIR]]{{[\\/]}}libfoo.a
+
+#--- foo.s
+.global foo
+foo:
+#--- deplibs.s
+.global __aarch64_ldadd4_relax
+__aarch64_ldadd4_relax:
+    b foo
+.section ".deplibs","MS",@llvm_dependent_libraries,1
+    .asciz "foo"
+#--- lto.ll
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64"
+
+define void @a(i32* nocapture %0) #0 {
+  %2 = atomicrmw add i32* %0, i32 1 monotonic, align 4
+  ret void
+}
+
+attributes #0 = { "target-features"="+outline-atomics" }