diff --git a/3rdparty/include/opencl/1.2/CL/cl_platform.h b/3rdparty/include/opencl/1.2/CL/cl_platform.h
index cf2b7210ac..46b3d9dcdc 100644
--- a/3rdparty/include/opencl/1.2/CL/cl_platform.h
+++ b/3rdparty/include/opencl/1.2/CL/cl_platform.h
@@ -92,7 +92,7 @@ extern "C" {
             #define CL_EXT_SUFFIX__VERSION_1_1_DEPRECATED __attribute__((deprecated))
             #define CL_EXT_PREFIX__VERSION_1_1_DEPRECATED    
         #endif
-    #elif _WIN32
+    #elif defined(_WIN32)
         #ifdef CL_USE_DEPRECATED_OPENCL_1_0_APIS
             #define CL_EXT_SUFFIX__VERSION_1_0_DEPRECATED    
             #define CL_EXT_PREFIX__VERSION_1_0_DEPRECATED