diff --git a/intern/cycles/kernel/kernel_compat_opencl.h b/intern/cycles/kernel/kernel_compat_opencl.h
index 1848f6059b6..4a9304a134c 100644
--- a/intern/cycles/kernel/kernel_compat_opencl.h
+++ b/intern/cycles/kernel/kernel_compat_opencl.h
@@ -162,7 +162,9 @@
 #define kernel_tex_fetch(tex, index) kernel_tex_array(tex)[(index)]
 
 /* define NULL */
-#define NULL 0
+#ifndef NULL
+#  define NULL ((void *)0)
+#endif
 
 /* enable extensions */
 #ifdef __KERNEL_CL_KHR_FP16__