diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88617d8f..9aa140f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Version 65:
 * Fix narrowing in inflate_stream
 * Fix narrowing in deflate_stream
 * Fix integer warnings
+* Enable unused variable warning on msvc cmake
 
 --------------------------------------------------------------------------------
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fbd5e191..fedec15a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,7 +13,7 @@ if (MSVC)
     add_definitions (-D_SCL_SECURE_NO_WARNINGS=1)
     add_definitions (-D_CRT_SECURE_NO_WARNINGS=1)
 
-    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4100 /MP /W4 /bigobj")
+    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP /W4 /bigobj")
     set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Ob2 /Oi /Ot /GL")
     set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /Oi /Ot")