diff --git a/clang/unittests/Tooling/CMakeLists.txt b/clang/unittests/Tooling/CMakeLists.txt
--- a/clang/unittests/Tooling/CMakeLists.txt
+++ b/clang/unittests/Tooling/CMakeLists.txt
@@ -7,6 +7,7 @@
 # By default MSVC has a 2^16 limit on the number of sections in an object file,
 # and this needs more than that.
 if (MSVC)
+  set_source_files_properties(RecursiveASTVisitorTests/Callbacks.cpp PROPERTIES COMPILE_FLAGS /bigobj)
   set_source_files_properties(RecursiveASTVisitorTest.cpp PROPERTIES COMPILE_FLAGS /bigobj)
   set_source_files_properties(RecursiveASTVisitorTestExprVisitor.cpp PROPERTIES COMPILE_FLAGS /bigobj)
   set_source_files_properties(SourceCodeTest.cpp PROPERTIES COMPILE_FLAGS /bigobj)