diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index ac92442a1..e930cbd2e 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -240,9 +240,7 @@ if (MSVC)
   # MSVC warning suppressions
   add_definitions(
     /wd4065 # switch statement contains 'default' but no 'case' labels
-    /wd4244 # 'conversion' conversion from 'type1' to 'type2', possible loss of data
     /wd4251 # 'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2'
-    /wd4267 # 'var' : conversion from 'size_t' to 'type', possible loss of data
     /wd4305 # 'identifier' : truncation from 'type1' to 'type2'
     /wd4307 # 'operator' : integral constant overflow
     /wd4309 # 'conversion' : truncation of constant value
@@ -250,7 +248,6 @@ if (MSVC)
     /wd4355 # 'this' : used in base member initializer list
     /wd4506 # no definition for inline function 'function'
     /wd4800 # 'type' : forcing value to bool 'true' or 'false' (performance warning)
-    /wd4996 # The compiler encountered a deprecated declaration.
   )
   # Allow big object
   add_definitions(/bigobj)
@@ -272,6 +269,8 @@ if (MSVC)
   endif()
 
   configure_file(version.rc.in ${CMAKE_CURRENT_BINARY_DIR}/version.rc @ONLY)
+else (MSVC)
+  set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -Wno-unused-parameter")
 endif (MSVC)
 
 
