diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3fd2b3e2a..3013e9566 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -95,6 +95,7 @@ else()
 endif()
 
 # FlightGear build options
+option(SIMGEAR_SHARED    "Set to ON when SimGear was built as a shared library" OFF)
 option(LOGGING           "Set to ON to build FlightGear with logging support (default)" ON)
 option(SP_FDMS           "Set to ON to build FlightGear with special-purpose FDMs" OFF)
 option(ENABLE_UIUC_MODEL "Set to ON to build FlightGear with UIUCModel FDM" OFF)