diff --git a/clang/unittests/StaticAnalyzer/CMakeLists.txt b/clang/unittests/StaticAnalyzer/CMakeLists.txt
--- a/clang/unittests/StaticAnalyzer/CMakeLists.txt
+++ b/clang/unittests/StaticAnalyzer/CMakeLists.txt
@@ -20,6 +20,11 @@
   TestReturnValueUnderConstruction.cpp
   )
 
+if(MSVC)
+  # warning C4309: 'initializing': truncation of constant value
+  set_source_files_properties(RangeSetTest.cpp PROPERTIES COMPILE_FLAGS -wd4309)
+endif()
+
 clang_target_link_libraries(StaticAnalysisTests
   PRIVATE
   clangBasic