diff --git a/CMakeLists.txt b/CMakeLists.txt
index 89d3c167a..3330977aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,7 +43,7 @@ option(GUI "Build GUI components (AlethZero, Mix)" ON)
 option(TESTS "Build the tests." ON)
 option(NOBOOST "No use of boost macros in test functions" OFF)
 option(EVMJIT "Build just-in-time compiler for EVM code (requires LLVM)" OFF)
-option(ETHASHCL "Build in support for GPU mining via OpenCL" OFF)
+option(ETHASHCL "Build in support for GPU mining via OpenCL" ON)
 option(JSCONSOLE "Build in javascript console" ON)
 
 # propagates CMake configuration options to the compiler