1 files changed, 5 insertions, 1 deletions
diff --git a/intern/cycles/kernel/kernel_light_common.h b/intern/cycles/kernel/kernel_light_common.h
index 4a683d36226..765d8f5338e 100644
--- a/intern/cycles/kernel/kernel_light_common.h
+++ b/intern/cycles/kernel/kernel_light_common.h
@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+#pragma once
+
+#include "kernel_montecarlo.h"
+
 CCL_NAMESPACE_BEGIN
 
 /* Area light sampling */
@@ -210,7 +214,7 @@ ccl_device bool light_spread_clamp_area_light(const float3 P,
   return true;
 }
 
-ccl_device float lamp_light_pdf(KernelGlobals *kg, const float3 Ng, const float3 I, float t)
+ccl_device float lamp_light_pdf(const KernelGlobals *kg, const float3 Ng, const float3 I, float t)
 {
   float cos_pi = dot(Ng, I);