diff --git a/src/sfnt/ttbdf.c b/src/sfnt/ttbdf.c
index bd2a94b9d..4aa182703 100644
--- a/src/sfnt/ttbdf.c
+++ b/src/sfnt/ttbdf.c
@@ -97,7 +97,7 @@
       if ( version != 0x0001                 ||
            strings < 8                       ||
            ( strings - 8 ) / 4 < num_strikes ||
-           strings + 1 > length              )
+           strings >= length                 )
         goto BadTable;
 
       bdf->num_strikes  = num_strikes;