2 files changed, 2 insertions, 2 deletions
diff --git a/src/arch/isa_parser.py b/src/arch/isa_parser.py
index 2db7c6aa6..bd45a8313 100755
--- a/src/arch/isa_parser.py
+++ b/src/arch/isa_parser.py
@@ -128,7 +128,7 @@ class ISAParser(Grammar):
 
     # Integer literal
     def t_INTLIT(self, t):
-        r'(0x[\da-fA-F]+)|\d+'
+        r'-?(0x[\da-fA-F]+)|\d+'
         try:
             t.value = int(t.value,0)
         except ValueError:
diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index d6cfdc593..0225657c4 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -419,7 +419,7 @@
                 // extend it, and there's no easy way to specify only checking
                 // the first byte.
                 0x5: decode IMMEDIATE {
-                    0xffffffffffffff80:
+                    -0x80:
                          SyscallInst::int80('xc->syscall(Rax)', IsSyscall);
                     default: int_Ib();
                 }