diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5877b9f..314d81b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Version 65:
+
+* Enable narrowing warning on msvc cmake
+
+--------------------------------------------------------------------------------
+
 Version 64:
 
 * Simplify buffered_read_stream composed op
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7fc401a0..fbd5e191 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 "${CMAKE_CXX_FLAGS} /wd4100 /wd4244 /MP /W4 /bigobj")
+    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4100 /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")