diff --git a/libs/models/brush/model_brush.c b/libs/models/brush/model_brush.c
index 3b1c942ef..048818678 100644
--- a/libs/models/brush/model_brush.c
+++ b/libs/models/brush/model_brush.c
@@ -467,7 +467,7 @@ CalcSurfaceExtents (msurface_t *s)
 		s->texturemins[i] = bmins[i] * 16;
 		s->extents[i] = (bmaxs[i] - bmins[i]) * 16;
 		if (!(tex->flags & TEX_SPECIAL) && s->extents[i] > 512 /* 256 */ )
-			Sys_Error ("Bad surface extents");
+			Sys_Error ("Bad surface extents: %x %d", tex->flags, s->extents[i]);
 	}
 }