Index: src/libcryptobox/chacha20/sse2.S
--- src/libcryptobox/chacha20/sse2.S.orig
+++ src/libcryptobox/chacha20/sse2.S
@@ -3,6 +3,7 @@
 SECTION_TEXT
 
 GLOBAL_HIDDEN_FN chacha_blocks_sse2
+endbr64
 chacha_blocks_sse2_local:
 pushq %rbx
 pushq %rbp
@@ -605,6 +606,7 @@ ret
 FN_END chacha_blocks_sse2
 
 GLOBAL_HIDDEN_FN hchacha_sse2
+endbr64
 hchacha_sse2_local:
 movq $0x3320646e61707865, %rax
 movq $0x6b20657479622d32, %r8
@@ -673,6 +675,7 @@ ret
 FN_END hchacha_sse2
 
 GLOBAL_HIDDEN_FN_EXT chacha_sse2, 6, 16
+endbr64
 pushq %rbp
 movq %rsp, %rbp
 subq $64, %rsp
@@ -701,6 +704,7 @@ ret
 FN_END chacha_sse2
 
 GLOBAL_HIDDEN_FN_EXT xchacha_sse2, 6, 16
+endbr64
 pushq %rbp
 pushq %rbx
 movq %rsp, %rbp
