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-rw-r--r--gas/config/tc-z80.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/gas/config/tc-z80.c b/gas/config/tc-z80.c
index 45fcd6f..2e17d00 100644
--- a/gas/config/tc-z80.c
+++ b/gas/config/tc-z80.c
@@ -3653,7 +3653,7 @@ md_assemble (char *str)
static int
is_overflow (long value, unsigned bitsize)
{
- long fieldmask = (1UL << bitsize) - 1;
+ long fieldmask = (2UL << (bitsize - 1)) - 1;
long signmask = ~fieldmask;
long a = value & fieldmask;
long ss = a & signmask;