diff --git a/host/libhackrf/CMakeLists.txt b/host/libhackrf/CMakeLists.txt
index 370a1c2d..000a4326 100644
--- a/host/libhackrf/CMakeLists.txt
+++ b/host/libhackrf/CMakeLists.txt
@@ -31,7 +31,8 @@ set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}")
 cmake_minimum_required(VERSION 2.8)
 
 add_definitions(-Wall)
-add_definitions(-std=c99)
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")
 
 find_package(USB1 REQUIRED)
 include_directories(${LIBUSB_INCLUDE_DIR})