--- host/libhackrf/CMakeLists.txt.orig
+++ host/libhackrf/CMakeLists.txt
@@ -37,7 +37,6 @@
 	set(THREADS_USE_PTHREADS_WIN32 true)
 else()
 	add_definitions(-Wall)
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu90")
 
 	INCLUDE(TestBigEndian)
 	TEST_BIG_ENDIAN(BIGENDIAN)
--- host/hackrf-tools/CMakeLists.txt.orig
+++ host/hackrf-tools/CMakeLists.txt
@@ -33,7 +33,6 @@
 add_definitions(/D _CRT_SECURE_NO_WARNINGS)
 else()
 add_definitions(-Wall)
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu90")
 endif()
 
 if(NOT libhackrf_SOURCE_DIR)