diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6d1e4f0b..893494ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -114,10 +114,10 @@ option(WITH_WEBCAM "Install INDI Webcam Driver based on FFMPEG" Off)
 
 if (FFMPEG_FOUND)
     message(STATUS "Since FFMPEG was found, INDI Webcam Driver can be built")
-    option(WITH_WEBCAM "Install INDI Webcam Driver based on FFMPEG" On)
+    set(WITH_WEBCAM On CACHE BOOL "Install INDI Webcam Driver based on FFMPEG" FORCE)
 ELSE(FFMPEG_FOUND)
     message(STATUS "Since an up to date FFMPEG was not found, INDI Webcam Driver will not be built")
-    option(WITH_WEBCAM "Install INDI Webcam Driver based on FFMPEG" Off)
+    set(WITH_WEBCAM Off CACHE BOOL "Install INDI Webcam Driver based on FFMPEG" FORCE)
 ENDIF(FFMPEG_FOUND)
 
 # Add/remove cases for OSX