diff --git a/src/core/system_parameters/gnss_ephemeris.cc b/src/core/system_parameters/gnss_ephemeris.cc
index a8698ed43..e9c7ba279 100644
--- a/src/core/system_parameters/gnss_ephemeris.cc
+++ b/src/core/system_parameters/gnss_ephemeris.cc
@@ -184,7 +184,7 @@ double Gnss_Ephemeris::sv_clock_relativistic_term(double transmitTime) const
         {
             n0 = sqrt(GALILEO_GM / (a * a * a));
         }
-    if (this->System == 'E')
+    else if (this->System == 'E')
         {
             n0 = sqrt(BEIDOU_GM / (a * a * a));
         }