diff --git a/ctz.go b/ctz.go
index 002a5acf..19848110 100644
--- a/ctz.go
+++ b/ctz.go
@@ -2,10 +2,6 @@
 
 package roaring
 
-import (
-	"github.com/klauspost/cpuid"
-)
-
 const deBruijn32 = 0x077CB531
 
 var deBruijn32Lookup = []byte{
@@ -22,13 +18,6 @@ var deBruijn64Lookup = []byte{
 	54, 26, 40, 15, 34, 20, 31, 10, 25, 14, 19, 9, 13, 8, 7, 6,
 }
 
-var useSSE42 bool
-
-// Detect SSE 4.2 feature.
-func init() {
-	useSSE42 = cpuid.CPU.SSE42()
-}
-
 // countTrailingZeros counts the number of zeros
 // from the least-significant bit up to the
 // first set (1) bit. if x is 0, 64 is returned.