diff --git a/libethash-cl/ethash_cl_miner_kernel.cl b/libethash-cl/ethash_cl_miner_kernel.cl
index a3e190034..09f17c342 100644
--- a/libethash-cl/ethash_cl_miner_kernel.cl
+++ b/libethash-cl/ethash_cl_miner_kernel.cl
@@ -1,3 +1,5 @@
+#pragma OPENCL EXTENSION cl_clang_storage_class_specifiers : enable
+
 #define OPENCL_PLATFORM_UNKNOWN 0
 #define OPENCL_PLATFORM_NVIDIA  1
 #define OPENCL_PLATFORM_AMD		2