diff --git a/runtime/bin/snapshot_empty.cc b/runtime/bin/snapshot_empty.cc
index 6fc5b9f67bd..2f122986e48 100644
--- a/runtime/bin/snapshot_empty.cc
+++ b/runtime/bin/snapshot_empty.cc
@@ -16,8 +16,8 @@ typedef unsigned __int8 uint8_t;
 namespace dart {
 namespace bin {
 
-const uint8_t* vm_isolate_snapshot_buffer = NULL;
-const uint8_t* const core_isolate_snapshot_buffer = NULL;
+extern const uint8_t* vm_isolate_snapshot_buffer = NULL;
+extern const uint8_t* const core_isolate_snapshot_buffer = NULL;
 
 }  // namespace bin
 }  // namespace dart