diff --git a/src/hb-dsalgs.hh b/src/hb-dsalgs.hh
index 4d3db9663c2c4f4644f697162b4aa629ceb3701c..6a8ddaa995be9110674820840f7647487c083187 100644
--- a/src/hb-dsalgs.hh
+++ b/src/hb-dsalgs.hh
@@ -220,7 +220,7 @@ hb_ctz (T v)
   {
     unsigned int shift = 64;
     return (uint64_t) v ? hb_bit_storage<uint64_t> ((uint64_t) v) :
-			  hb_bit_storage<uint64_t> ((uint64_t) v >> shift) + shift;
+			  hb_bit_storage<uint64_t> ((uint64_t) (v >> shift)) + shift;
   }
 
   assert (0);