diff --git a/compiler-rt/lib/builtins/emutls.c b/compiler-rt/lib/builtins/emutls.c
index 390ffb25f6cf0..ca18da2fffe6f 100644
--- a/compiler-rt/lib/builtins/emutls.c
+++ b/compiler-rt/lib/builtins/emutls.c
@@ -392,8 +392,12 @@ __attribute__((visibility("default"), weak))
 void *__emutls_get_address(__emutls_control *control) {
   uintptr_t index = emutls_get_index(control);
   emutls_address_array *array = emutls_get_address_array(index--);
-  if (array->data[index] == NULL)
-    array->data[index] = emutls_allocate_object(control);
+  if (array->data[index] == NULL) {
+    emutls_lock();
+    if (array->data[index] == NULL)
+      array->data[index] = emutls_allocate_object(control);
+    emutls_unlock();
+  }
   return array->data[index];
 }