diff --git a/CMakeLists.txt b/CMakeLists.txt
index f8292a12..3f33467f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,7 @@
 cmake_minimum_required (VERSION 3.4)
 project (synergy C CXX)
 
+option (SYNERGY_BUILD_LEGACY_GUI "Build the legacy GUI (synergy)" ON)
 option (SYNERGY_BUILD_LEGACY_SERVICE "Build the legacy service (synergyd)" ON)
 option (SYNERGY_BUILD_LEGACY_INSTALLER "Build the installer" ON)
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d6da3d8f..ab63a066 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -19,4 +19,6 @@ include_directories (${CMAKE_CURRENT_BINARY_DIR}/lib)
 
 add_subdirectory(lib)
 add_subdirectory(cmd)
+if (SYNERGY_BUILD_LEGACY_GUI)
 add_subdirectory(gui)
+endif (SYNERGY_BUILD_LEGACY_GUI)