diff --git a/alaw.go b/alaw.go
index 5120fb8..40945c3 100644
--- a/alaw.go
+++ b/alaw.go
@@ -92,7 +92,7 @@ func EncodeAlawFrame(frame int16) uint8 {
 	compressedByte = frame >> 4
 	if compressedByte > 15 {
 		seg = int16(12 - bits.LeadingZeros16(uint16(compressedByte)))
-		compressedByte >>= seg - 1
+		compressedByte >>= uint(seg - 1)
 		compressedByte -= 16
 		compressedByte += seg << 4
 	}
diff --git a/ulaw.go b/ulaw.go
index f0cf821..165e166 100644
--- a/ulaw.go
+++ b/ulaw.go
@@ -99,7 +99,7 @@ func EncodeUlawFrame(frame int16) uint8 {
 		frame = ulawClip
 	}
 	seg = int16(16 - bits.LeadingZeros16(uint16(frame>>5)))
-	lowNibble = 0x000F - ((frame >> (seg)) & 0x000F)
+	lowNibble = 0x000F - ((frame >> uint(seg)) & 0x000F)
 	return uint8(sign | ((8 - seg) << 4) | lowNibble)
 }