diff --git a/PDP11/pdp11_sys.c b/PDP11/pdp11_sys.c
index 3adf48e91..b25e26d98 100644
--- a/PDP11/pdp11_sys.c
+++ b/PDP11/pdp11_sys.c
@@ -376,8 +376,7 @@ static const int32 masks[] = {
 0177700+I_D, 0177400+I_D, 0177700, 0177400,
 0177400, 0177000, 0177000, 0177400,
 0177400+I_D+I_L, 0170000, 0177777, 0177777,
-0177000+I_D, 0177400+I_D, 0177700, 0177400,
-0177000, 0177700+I_D, 0177400, 0177400+I_D+I_L
+0177000, 0177400+I_D, 0177400, 0177400+I_D+I_L
 };
 
 static const char *opcode[] = {