diff --git a/nexus/arch.cc b/nexus/arch.cc
index efaf2632..3b3c4239 100644
--- a/nexus/arch.cc
+++ b/nexus/arch.cc
@@ -736,7 +736,10 @@ BoundingBox Arch::getRouteBoundingBox(WireId src, WireId dst) const
         bb.y0 = std::max<int>(0, bb.y0 - 7);
         bb.y1 = std::min<int>(chip_info->width, bb.y1 + 7);
     }
-
+    if (dqsbuf_wires.count(src) || dqsbuf_wires.count(dst)) {
+        bb.x0 = std::max<int>(0, bb.x0 - 6);
+        bb.x1 = std::min<int>(chip_info->width, bb.x1 + 6);
+    }
     return bb;
 }
 
@@ -796,6 +799,13 @@ void Arch::pre_routing()
                     lram_wires.insert(wire);
             }
         }
+        if (ci->type == id_DQSBUF_CORE) {
+            for (auto &port : ci->ports) {
+                WireId wire = getBelPinWire(ci->bel, port.first);
+                if (wire != WireId())
+                    dqsbuf_wires.insert(wire);
+            }
+        }
     }
 }
 namespace {
diff --git a/nexus/arch.h b/nexus/arch.h
index 3a80b47b..a229b4d6 100644
--- a/nexus/arch.h
+++ b/nexus/arch.h
@@ -1319,7 +1319,7 @@ struct Arch : BaseArch<ArchRanges>
 
     // for better DSP bounding boxes
     void pre_routing();
-    pool<WireId> dsp_wires, lram_wires;
+    pool<WireId> dsp_wires, lram_wires, dqsbuf_wires;
 
     // -------------------------------------------------