diff --git a/src/v_video.cpp b/src/v_video.cpp
index df92fa3e19..44f5626222 100644
--- a/src/v_video.cpp
+++ b/src/v_video.cpp
@@ -879,7 +879,7 @@ void IVideo::DumpAdapters ()
 	Printf("Multi-monitor support unavailable.\n");
 }
 
-CUSTOM_CVAR(Bool, fullscreen, false, CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_NOINITCALL)
+CUSTOM_CVAR(Bool, fullscreen, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_NOINITCALL)
 {
 	setmodeneeded = true;
 }