Index: src/amd64/asmdefs.inc
--- src/amd64/asmdefs.inc.orig
+++ src/amd64/asmdefs.inc
@@ -25,7 +25,7 @@
 #endif
 
 #if defined ALLEGRO_UNIX
-  #define FUNC(name)            .globl name ; _align_ ; .type name,@function ; name:
+  #define FUNC(name)            .globl name ; _align_ ; .type name,@function ; name: ; endbr64
 #else
   #define FUNC(name)            .globl name ; _align_ ; name:
 #endif
