diff --git a/x86_64-asm.h b/x86_64-asm.h
index 339e1dfba..e4655a7a6 100644
--- a/x86_64-asm.h
+++ b/x86_64-asm.h
@@ -225,6 +225,8 @@ ALT(DEF_ASM_OP2(shrdw, 0x0fad, 0, OPC_MODRM | OPC_WLX, OPT_REGW, OPT_EA | OPT_RE
 
 ALT(DEF_ASM_OP1(call, 0xff, 2, OPC_MODRM, OPT_INDIR))
 ALT(DEF_ASM_OP1(call, 0xe8, 0, 0, OPT_DISP))
+    DEF_ASM_OP1(callq, 0xff, 2, OPC_MODRM, OPT_INDIR)
+ALT(DEF_ASM_OP1(callq, 0xe8, 0, 0, OPT_DISP))
 ALT(DEF_ASM_OP1(jmp, 0xff, 4, OPC_MODRM, OPT_INDIR))
 ALT(DEF_ASM_OP1(jmp, 0xeb, 0, 0, OPT_DISP8))