diff --git a/PDP11/pdp11_rf.c b/PDP11/pdp11_rf.c
index c0af75b5..b449639e 100644
--- a/PDP11/pdp11_rf.c
+++ b/PDP11/pdp11_rf.c
@@ -382,7 +382,7 @@ do {
     } while ((rf_wc != 0) && (rf_burst != 0));          /* brk if wc, no brst */
 
 rf_da = da & DMASK;                                     /* split da */
-rf_dae = (rf_dae & ~RFDAE_DAE) | ((rf_da >> 16) & RFDAE_DAE);
+rf_dae = (rf_dae & ~RFDAE_DAE) | ((da >> 16) & RFDAE_DAE);
 rf_cma = ma & DMASK;                                    /* split ma */
 rf_cs = (rf_cs & ~RFCS_MEX) | ((ma >> (16 - RFCS_V_MEX)) & RFCS_MEX); 
 if ((rf_wc != 0) && ((rf_cs & RFCS_ERR) == 0))          /* more to do? */