diff --git a/CMakeLists.txt b/CMakeLists.txt
index 84a74d7..15b458b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -166,7 +166,13 @@
 find_package(JPEG REQUIRED)
 
 # Warn if it doesn't seem to be the accelerated libjpeg that's found
+set(CMAKE_REQUIRED_LIBRARIES_OLD ${CMAKE_REQUIRED_LIBRARIES})
+set(CMAKE_REQUIRED_FLAGS_OLD ${CMAKE_REQUIRED_FLAGS})
+set(CMAKE_REQUIRED_LIBRARIES ${JPEG_LIBRARIES})
+set(CMAKE_REQUIRED_FLAGS -I${JPEG_INCLUDE_DIR})
 check_c_source_compiles("#include <stdio.h>\n#include <jpeglib.h>\nint main(int c, char** v) { return JCS_EXT_RGBX; }" FOUND_JPEG_TURBO)
+set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES_OLD})
+set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_OLD})
 if(NOT FOUND_JPEG_TURBO)
   message(STATUS "WARNING: You are not using libjpeg-turbo. Performance will suffer.")
 endif()