Index: simd/x86_64/jcphuff-sse2.asm
--- simd/x86_64/jcphuff-sse2.asm.orig
+++ simd/x86_64/jcphuff-sse2.asm
@@ -282,6 +282,7 @@
     GLOBAL_FUNCTION(jsimd_encode_mcu_AC_first_prepare_sse2)
 
 EXTN(jsimd_encode_mcu_AC_first_prepare_sse2):
+    _endbr64
     push        rbp
     mov         rbp, rsp
     and         rsp, byte (-SIZEOF_XMMWORD)  ; align to 128 bits
@@ -445,6 +446,7 @@ EXTN(jsimd_encode_mcu_AC_first_prepare_sse2):
     GLOBAL_FUNCTION(jsimd_encode_mcu_AC_refine_prepare_sse2)
 
 EXTN(jsimd_encode_mcu_AC_refine_prepare_sse2):
+    _endbr64
     push        rbp
     mov         rbp, rsp
     and         rsp, byte (-SIZEOF_XMMWORD)  ; align to 128 bits
