diff --git a/CMakeLists.txt b/CMakeLists.txt
index fdc19a18c..88bbb6e3a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -86,7 +86,7 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGXX)
     if(BUILD_ENABLE_CXX11)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     endif(BUILD_ENABLE_CXX11)
-    set(CMAKE_CXX_FLAGS "-Wall -Wno-write-strings ${CMAKE_CXX_FLAGS}")
+    set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-write-strings ${CMAKE_CXX_FLAGS}")
     INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})
 
     # get linker errors as soon as possible and not at runtime e.g. for modules
diff --git a/src/3rdParty/salomesmesh/CMakeLists.txt b/src/3rdParty/salomesmesh/CMakeLists.txt
index 6c2dce7f5..7a24b548d 100644
--- a/src/3rdParty/salomesmesh/CMakeLists.txt
+++ b/src/3rdParty/salomesmesh/CMakeLists.txt
@@ -7,9 +7,9 @@ SET(SMESH_VERSION_PATCH 2)
 SET(SMESH_VERSION_TWEAK 2)
 
 if(CMAKE_COMPILER_IS_GNUCXX)
-    set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -Wno-sign-compare -Wno-reorder -Wno-switch -Wno-unused-variable -Wno-unused-but-set-variable -Wno-comment")
+    set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -Wno-sign-compare -Wno-reorder -Wno-switch -Wno-unused-variable -Wno-unused-but-set-variable -Wno-comment -Wno-unused-parameter")
 elseif(CMAKE_COMPILER_IS_CLANGXX)
-    set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -Wno-sign-compare -Wno-reorder -Wno-switch -Wno-unused-variable -Wno-unused-private-field -Wno-unused-function -Wno-sometimes-uninitialized -Wno-overloaded-virtual -Wno-dynamic-class-memaccess -Wno-comment")
+    set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -Wno-sign-compare -Wno-reorder -Wno-switch -Wno-unused-variable -Wno-unused-private-field -Wno-unused-function -Wno-sometimes-uninitialized -Wno-overloaded-virtual -Wno-dynamic-class-memaccess -Wno-comment -Wno-unused-parameter")
 endif()
 
 if(CMAKE_COMPILER_IS_CLANGXX)