diff --git a/lld/MachO/LTO.cpp b/lld/MachO/LTO.cpp
--- a/lld/MachO/LTO.cpp
+++ b/lld/MachO/LTO.cpp
@@ -40,6 +40,8 @@
   if (config->saveTemps)
     checkError(c.addSaveTemps(config->outputFile.str() + ".",
                               /*UseInputModulePath=*/true));
+  c.TimeTraceEnabled = config->timeTraceEnabled;
+  c.TimeTraceGranularity = config->timeTraceGranularity;
   return c;
 }
 
diff --git a/lld/test/MachO/thinlto-time-trace.ll b/lld/test/MachO/thinlto-time-trace.ll
new file mode 100644
--- /dev/null
+++ b/lld/test/MachO/thinlto-time-trace.ll
@@ -0,0 +1,45 @@
+; REQUIRES: x86
+; RUN: rm -rf %t; split-file %s %t
+
+; Test ThinLTO with time trace
+; RUN: opt -module-summary %t/f.s -o %t/f.o
+; RUN: opt -module-summary %t/g.s -o %t/g.o
+; RUN: %lld --time-trace --time-trace-granularity=0 -dylib %t/f.o %t/g.o -o %t/libTest.dylib
+; RUN: cat %t/libTest.dylib.time-trace \
+; RUN:   | %python -c 'import json, sys; json.dump(json.loads(sys.stdin.read()), sys.stdout, sort_keys=True, indent=2)' \
+; RUN:   | FileCheck %s
+
+; CHECK: "traceEvents": [
+; Check fields for an event are present
+; CHECK: "args":
+; CHECK-NEXT: "detail":
+; CHECK: "dur":
+; CHECK-NEXT: "name":
+; CHECK-NEXT: "ph":
+; CHECK-NEXT: "pid":
+; CHECK-NEXT: "tid":
+; CHECK-NEXT: "ts":
+
+; Check that an optimization event is present
+; CHECK: "name": "OptModule"
+
+;--- f.s
+target triple = "x86_64-apple-darwin"
+target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+declare void @g(...)
+
+define void @f() {
+entry:
+  call void (...) @g()
+  ret void
+}
+
+;--- g.s
+target triple = "x86_64-apple-darwin"
+target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @g() {
+entry:
+  ret void
+}