diff --git a/polymer/eduke32/build/src/polymost.c b/polymer/eduke32/build/src/polymost.c
index d0a70bc35..1db92a6e2 100644
--- a/polymer/eduke32/build/src/polymost.c
+++ b/polymer/eduke32/build/src/polymost.c
@@ -6386,7 +6386,7 @@ void polymost_initosdfuncs(void)
         { "r_redbluemode","r_redbluemode: enable/disable experimental OpenGL red-blue glasses mode",(void *) &glredbluemode, CVAR_BOOL, 0, 1 },
         { "r_shadescale","r_shadescale: multiplier for shading",(void *) &shadescale, CVAR_FLOAT, 0, 10 },
         { "r_shadescale_unbounded","r_shadescale_unbounded: enable/disable allowance of complete blackness",(void *) &shadescale_unbounded, CVAR_BOOL, 0, 1 },
-        { "r_swapinterval","r_swapinterval: sets the GL swap interval (VSync)",(void *) &vsync, CVAR_BOOL|CVAR_FUNCPTR, 0, 1 },
+        { "r_swapinterval","r_swapinterval: sets the GL swap interval (VSync)",(void *) &vsync, CVAR_INT|CVAR_FUNCPTR, -1, 1 },
         { "r_texcache","r_texcache: enable/disable OpenGL compressed texture cache",(void *) &glusetexcache, CVAR_INT, 0, 2 },
         { "r_memcache","r_memcache: enable/disable texture cache memory cache",(void *) &glusememcache, CVAR_BOOL, 0, 1 },
         { "r_texcompr","r_texcompr: enable/disable OpenGL texture compression",(void *) &glusetexcompr, CVAR_BOOL, 0, 1 },
diff --git a/polymer/eduke32/source/menus.c b/polymer/eduke32/source/menus.c
index d7d60f4dd..890bdbf63 100644
--- a/polymer/eduke32/source/menus.c
+++ b/polymer/eduke32/source/menus.c
@@ -2743,9 +2743,10 @@ cheat_for_port_credits2:
                 case 3:
                 {
                     int32_t ovsync = vsync;
-                    if (x==io) vsync = !vsync;
-                    modval(0,1,(int32_t *)&vsync,1,probey==io);
-                    mgametextpal(d,yy, vsync? "Yes" : "No", MENUHIGHLIGHT(io), 0);
+                    if (x==io) vsync++;
+                    if (vsync == 2) vsync = -1;
+                    modval(-1,1,(int32_t *)&vsync,1,probey==io);
+                    mgametextpal(d,yy, vsync < 0 ? "Adaptive" : vsync ? "Yes" : "No", MENUHIGHLIGHT(io), 0);
                     if (vsync != ovsync)
                         setvsync(vsync);
                     break;