diff --git a/qiskit/providers/models/backendconfiguration.py b/qiskit/providers/models/backendconfiguration.py
index 17da093d784c..42c37410ed7f 100644
--- a/qiskit/providers/models/backendconfiguration.py
+++ b/qiskit/providers/models/backendconfiguration.py
@@ -270,7 +270,7 @@ def __init__(self, backend_name, backend_version, n_qubits,
         self.dynamic_reprate_enabled = dynamic_reprate_enabled
         if rep_delay_range:
             self.rep_delay_range = [_rd * 1e-6 for _rd in rep_delay_range]  # convert to sec
-        if default_rep_delay:
+        if default_rep_delay is not None:
             self.default_rep_delay = default_rep_delay * 1e-6   # convert to sec
 
         # max_experiments must be >=1