diff --git a/CMakeLists.txt b/CMakeLists.txt
index cbaff68..3cf6651 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -100,7 +100,8 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wconversion -Wshadow")
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
   # using GCC
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wconversion -Wshadow -Wextra -Wsign-conversion -pedantic")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wconversion -Wshadow -Wextra -pedantic")
+  # not yet ready for -Wsign-conversion
 endif()
 
 IF(JSONCPP_WITH_WARNING_AS_ERROR)