diff --git a/src/sdl/i_video.c b/src/sdl/i_video.c
index 7123a2d20..e6a40327b 100644
--- a/src/sdl/i_video.c
+++ b/src/sdl/i_video.c
@@ -100,6 +100,7 @@ boolean highcolor = false;
 // synchronize page flipping with screen refresh
 consvar_t cv_vidwait = {"vid_wait", "On", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
 static consvar_t cv_stretch = {"stretch", "Off", CV_SAVE|CV_NOSHOWHELP, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
+static consvar_t cv_alwaysgrabmouse = {"alwaysgrabmouse", "Off", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
 
 UINT8 graphics_started = 0; // Is used in console.c and screen.c
 
@@ -109,7 +110,7 @@ static SDL_bool disable_fullscreen = SDL_FALSE;
 #define USE_FULLSCREEN (disable_fullscreen||!allow_fullscreen)?0:cv_fullscreen.value
 static SDL_bool disable_mouse = SDL_FALSE;
 #define USE_MOUSEINPUT (!disable_mouse && cv_usemouse.value && havefocus)
-#define IGNORE_MOUSE (menuactive || paused || con_destlines || chat_on || gamestate != GS_LEVEL)
+#define IGNORE_MOUSE (!cv_alwaysgrabmouse.value && (menuactive || paused || con_destlines || chat_on || gamestate != GS_LEVEL))
 #define MOUSE_MENU false //(!disable_mouse && cv_usemouse.value && menuactive && !USE_FULLSCREEN)
 #define MOUSEBUTTONS_MAX MOUSEBUTTONS
 
@@ -1626,6 +1627,7 @@ void I_StartupGraphics(void)
 	COM_AddCommand ("vid_mode", VID_Command_Mode_f);
 	CV_RegisterVar (&cv_vidwait);
 	CV_RegisterVar (&cv_stretch);
+	CV_RegisterVar (&cv_alwaysgrabmouse);
 	disable_mouse = M_CheckParm("-nomouse");
 	disable_fullscreen = M_CheckParm("-win") ? 1 : 0;