diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9741b45f9..11b397024 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -281,7 +281,7 @@ message(STATUS "Wrote ${PROJECT_BINARY_DIR}/config.h")
 configure_file(${PROJECT_SOURCE_DIR}/cmake/json_config.h.in   ${PROJECT_BINARY_DIR}/json_config.h)
 message(STATUS "Wrote ${PROJECT_BINARY_DIR}/json_config.h")
 
-if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
+if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" AND NOT MSVC)
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -ffunction-sections -fdata-sections")
 	if ("${DISABLE_WERROR}" STREQUAL "OFF")
 	    set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Werror")
@@ -297,7 +297,7 @@ if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_C_COMPILER_ID}" STREQUAL
     endif()
 
     add_definitions(-D_GNU_SOURCE)
-elseif ("${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC")
+elseif (MSVC)
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} /DEBUG")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} /wd4100")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} /wd4996")