diff --git a/host/lib/usrp/b300/b300_clock_ctrl.cpp b/host/lib/usrp/b300/b300_clock_ctrl.cpp
index 61050fee1..c65210a86 100644
--- a/host/lib/usrp/b300/b300_clock_ctrl.cpp
+++ b/host/lib/usrp/b300/b300_clock_ctrl.cpp
@@ -245,9 +245,7 @@ public:
                     bar0_regmap_t::lmk_sync_ctrl_reg_t::SYNC_PIN_CLKIN0);
             }
         } else {
-            if (_clkin_sel == CLKin1) {
-                _10M_ext_ref = true;
-            }
+            _10M_ext_ref        = (_clkin_sel == CLKin1);
             _distributed_clocks = false;
             _output_divider     = 20;
             _sysref_div         = 640;