1 files changed, 2 insertions, 2 deletions

diff --git a/isa/decode.cpp b/isa/decode.cpp
index 03e2225..dde5b74 100644
--- a/isa/decode.cpp
+++ b/isa/decode.cpp
@@ -168,9 +168,9 @@ instruction_context decode(unsigned int dfifb, unsigned int pc, unsigned int bit
                     }
                     if (ral && !rar) {
                         unsigned int x = (ctx.link.value() << 12) | ctx.acc.value();
-                        x = ((x << 1) & 07777) | (x >> 12);
+                        x = ((x << 1) & 017777) | (x >> 12);
                         if (bsw)
-                            x = ((x << 1) & 07777) | (x >> 12);
+                            x = ((x << 1) & 017777) | (x >> 12);
                         ctx.link = x >> 12;
                         ctx.acc = x & 07777;
                     }