1 files changed, 2 insertions, 0 deletions
diff --git a/mines.c b/mines.c
index c933f49..25b2206 100644
--- a/mines.c
+++ b/mines.c
@@ -261,6 +261,8 @@ static const char *validate_params(const game_params *params, bool full)
      */
     if (full && params->unique && (params->w <= 2 || params->h <= 2))
 	return "Width and height must both be greater than two";
+    if (params->w < 1 || params->h < 1)
+	return "Width and height must both be at least one";
     if (params->w > INT_MAX / params->h)
         return "Width times height must not be unreasonably large";
     if (params->n < 0)