diff --git a/CMakeLists.txt b/CMakeLists.txt
index 47519337c..3fd2b3e2a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -132,6 +132,7 @@ if(EVENT_INPUT)
             message(WARNING "UDev not found, event input is disabled!")
             set(EVENT_INPUT 0)
         else()
+            add_definitions(-DWITH_EVENTINPUT)
             set(EVENT_INPUT_LIBRARIES ${UDEV_LIBRARIES})
             message(STATUS "event-based input enabled. Using ${UDEV_LIBRARIES}")
         endif()
diff --git a/src/Input/CMakeLists.txt b/src/Input/CMakeLists.txt
index a0031c2cb..009929dce 100644
--- a/src/Input/CMakeLists.txt
+++ b/src/Input/CMakeLists.txt
@@ -19,7 +19,7 @@ set(SOURCES
 	FGJoystickInput.cxx
 	FGKeyboardInput.cxx
 	FGMouseInput.cxx
-	input.cxx	
+	input.cxx
 	)
 
 set(HEADERS
@@ -37,7 +37,6 @@ if(EVENT_INPUT)
 	list(APPEND SOURCES ${EVENT_INPUT_SOURCES})
 	list(APPEND SOURCES ${EVENT_INPUT_HEADERS})
 	include_directories(${UDEV_INCLUDE_DIR})
-	add_definitions(-DWITH_EVENTINPUT)
 endif()
 
 set(FGJS_SOURCES