diff --git a/src/internal/bytealg/index_amd64.s b/src/internal/bytealg/index_amd64.s
index 04314917b8..31730e5394 100644
--- a/src/internal/bytealg/index_amd64.s
+++ b/src/internal/bytealg/index_amd64.s
@@ -39,6 +39,7 @@ no_sse42:
 	JA   _3_or_more
 	MOVW (R8), R8
 	LEAQ -1(DI)(DX*1), DX
+	PCALIGN $16
 loop2:
 	MOVW (DI), SI
 	CMPW SI,R8
@@ -250,6 +251,7 @@ sse42:
 	LEAQ -15(DI)(DX*1), SI
 	MOVQ $16, R9
 	SUBQ AX, R9 // We advance by 16-len(sep) each iteration, so precalculate it into R9
+	PCALIGN $16
 loop_sse42:
 	// 0x0c means: unsigned byte compare (bits 0,1 are 00)
 	// for equality (bits 2,3 are 11)