diff --git a/src/arch/arm/isa/formats/aarch64.isa b/src/arch/arm/isa/formats/aarch64.isa
index 0179f2f..0cb8e9c 100644
--- a/src/arch/arm/isa/formats/aarch64.isa
+++ b/src/arch/arm/isa/formats/aarch64.isa
@@ -254,7 +254,7 @@
                   case 0x03:
                     return new Smc64(machInst);
                   case 0x04:
-                    return new FailUnimplemented("brk", machInst);
+                    return new Brk64(machInst);
                   case 0x08:
                     return new FailUnimplemented("hlt", machInst);
                   case 0x15: