diff --git a/CMakeLists.txt b/CMakeLists.txt
index 036b4ef4..fc072670 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,7 @@ add_definitions(-DCL_USE_DEPRECATED_OPENCL_2_0_APIS=1)
 add_definitions(-DCL_USE_DEPRECATED_OPENCL_1_2_APIS=1)
 add_definitions(-DCL_USE_DEPRECATED_OPENCL_1_1_APIS=1)
 add_definitions(-DCL_USE_DEPRECATED_OPENCL_1_0_APIS=1)
+add_definitions(-DCL_NO_EXTENSION_PROTOTYPES)
 
 option(USE_CL_EXPERIMENTAL "Use Experimental definitions" OFF)
 if(USE_CL_EXPERIMENTAL)