diff --git a/mkfont.c b/mkfont.c
index 942f1a3..9611d01 100644
--- a/mkfont.c
+++ b/mkfont.c
@@ -444,7 +444,7 @@ int main( int argc, char **argv )
 	// third pass to compute the maximum cell size (for memory allocation)
 	if ( autosize )
 	{
-		h = fnt->size->metrics.height>>6;
+		h = (fnt->size->metrics.height>>6)+1;
 		if ( FT_IS_FIXED_WIDTH(fnt) )
 		{
 			w = fnt->size->metrics.max_advance>>6;