diff --git a/external/SDL2/CMakeLists.txt b/external/SDL2/CMakeLists.txt
index 4c0f6fd0..8a8ab4d6 100644
--- a/external/SDL2/CMakeLists.txt
+++ b/external/SDL2/CMakeLists.txt
@@ -257,7 +257,7 @@ add_definitions(-DUSING_GENERATED_CONFIG_H)
 # General includes
 include_directories(${SDL2_BINARY_DIR}/include ${SDL2_SOURCE_DIR}/include)
 if(USE_GCC OR USE_CLANG)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter ${SDL2_SOURCE_DIR}/src/video/khronos")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter \"${SDL2_SOURCE_DIR}/src/video/khronos\"")
 else()
   include_directories(${SDL2_SOURCE_DIR}/src/video/khronos)
 endif()
diff --git a/external/SDL2/cmake/sdlchecks.cmake b/external/SDL2/cmake/sdlchecks.cmake
index 5d4d2f93..77e40122 100644
--- a/external/SDL2/cmake/sdlchecks.cmake
+++ b/external/SDL2/cmake/sdlchecks.cmake
@@ -1086,7 +1086,7 @@ macro(CheckHIDAPI)
       set(HAVE_SDL_JOYSTICK TRUE)
       file(GLOB HIDAPI_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/hidapi/*.c)
       set(SOURCE_FILES ${SOURCE_FILES} ${HIDAPI_SOURCES})
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBUSB_CFLAGS} -I${SDL2_SOURCE_DIR}/src/hidapi/hidapi")
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBUSB_CFLAGS} \"-I${SDL2_SOURCE_DIR}/src/hidapi/hidapi\"")
       if(NOT HIDAPI_SKIP_LIBUSB)
         set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/hidapi/libusb/hid.c)
         list(APPEND EXTRA_LIBS ${LIBUSB_LIBS})