diff --git a/intern/cycles/kernel/kernel_compat_opencl.h b/intern/cycles/kernel/kernel_compat_opencl.h
index 66cf0bb996b..2bf3b58ce99 100644
--- a/intern/cycles/kernel/kernel_compat_opencl.h
+++ b/intern/cycles/kernel/kernel_compat_opencl.h
@@ -98,6 +98,7 @@
 #define tanf(x) tan(((float)x))
 #define logf(x) log(((float)x))
 #define floorf(x) floor(((float)x))
+#define ceilf(x) ceil(((float)x))
 #define expf(x) exp(((float)x))
 #define hypotf(x, y) hypot(((float)x), ((float)y))
 #define atan2f(x, y) atan2(((float)x), ((float)y))