diff --git a/lib/popcnt.asm b/lib/popcnt.asm
index 52d6fb2..d03694a 100644
--- a/lib/popcnt.asm
+++ b/lib/popcnt.asm
@@ -5,21 +5,21 @@ popcnt:
   mov bx, ax
   and ax, 0x5555 ; 8x 01
   and bx, 0xaaaa ; 8x 10
-  sar bx, 1
+  shr bx, 1
   add ax, bx
 
   mov bx, ax
   and ax, 0x3333 ; 4x 0011
   and bx, 0xcccc ; 4x 1100
   mov cl, 2
-  sar bx, cl
+  shr bx, cl
   add ax, bx
 
   mov bx, ax
   and ax, 0x0f0f ; 2x 00001111
   and bx, 0xf0f0 ; 2x 11110000
   mov cl, 4
-  sar bx, cl
+  shr bx, cl
   add ax, bx
 
   add al, ah