diff --git a/intern/cycles/kernel/shaders/CMakeLists.txt b/intern/cycles/kernel/shaders/CMakeLists.txt
index 1c9445107ad..b1604978cce 100644
--- a/intern/cycles/kernel/shaders/CMakeLists.txt
+++ b/intern/cycles/kernel/shaders/CMakeLists.txt
@@ -131,7 +131,7 @@ foreach(_file ${SRC_OSL})
   string(REPLACE ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR} _OSO_FILE ${_OSO_FILE})
   add_custom_command(
     OUTPUT ${_OSO_FILE}
-    COMMAND ${OSL_COMPILER} -q -O2  -I"${CMAKE_CURRENT_SOURCE_DIR}" -o ${_OSO_FILE} ${_OSL_FILE}
+    COMMAND ${OSL_COMPILER} -q -O2  -I"${CMAKE_CURRENT_SOURCE_DIR}" -I"${OSL_SHADER_DIR}" -o ${_OSO_FILE} ${_OSL_FILE}
     DEPENDS ${_OSL_FILE} ${SRC_OSL_HEADERS} ${OSL_COMPILER})
   list(APPEND SRC_OSO
     ${_OSO_FILE}