diff --git a/core/lib/FileHandling/RINEX3/Rinex3NavData.cpp b/core/lib/FileHandling/RINEX3/Rinex3NavData.cpp
index ff4cbe23a..f5c293441 100644
--- a/core/lib/FileHandling/RINEX3/Rinex3NavData.cpp
+++ b/core/lib/FileHandling/RINEX3/Rinex3NavData.cpp
@@ -96,6 +96,7 @@ namespace gnsstk
       Tgd2 = 0.0;
 
       // perturbations
+      Cuc = rnd.Cuc;
       Cus = rnd.Cus;
       Crc = rnd.Crc;
       Crs = rnd.Crs;