diff --git a/CMakeLists.txt b/CMakeLists.txt
index 47df2fe6e75ec69ff177be36d584093a3e1380d6..20ef46c728f3611791145fe8caa89c6f8875ac00 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,6 +74,7 @@ set_property (GLOBAL PROPERTY USE_FOLDERS ON)
 
 if (MSVC)
   list (APPEND PBRT_DEFINITIONS "PBRT_IS_MSVC" "_CRT_SECURE_NO_WARNINGS")
+  list (APPEND PBRT_DEFINITIONS "PBRT_IS_MSVC" "_ENABLE_EXTENDED_ALIGNED_STORAGE")
 endif ()
 
 if (PBRT_FLOAT_AS_DOUBLE)