diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.cc b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.cc
index 2ace76e77..580bc8bdc 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.cc
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_cc.cc
@@ -362,12 +362,12 @@ int gps_l1_ca_telemetry_decoder_cc::general_work(int noutput_items __attribute__
     else
         {
             d_TOW_at_current_symbol += GPS_L1_CA_CODE_PERIOD;
-            d_TOW_at_current_symbol_ms++;
+            d_TOW_at_current_symbol_ms += GPS_L1_CA_CODE_PERIOD_MS;
         }
 
-     current_symbol.TOW_at_current_symbol_s = static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0;
-     //current_symbol.TOW_at_current_symbol_s = d_TOW_at_current_symbol;
-     current_symbol.Flag_valid_word = flag_TOW_set;
+    current_symbol.TOW_at_current_symbol_s = static_cast<double>(d_TOW_at_current_symbol_ms) / 1000.0;
+    //current_symbol.TOW_at_current_symbol_s = d_TOW_at_current_symbol;
+    current_symbol.Flag_valid_word = flag_TOW_set;
 
     if (flag_PLL_180_deg_phase_locked == true)
         {
diff --git a/src/core/system_parameters/GPS_L1_CA.h b/src/core/system_parameters/GPS_L1_CA.h
index cf2611344..c5ae95618 100644
--- a/src/core/system_parameters/GPS_L1_CA.h
+++ b/src/core/system_parameters/GPS_L1_CA.h
@@ -53,6 +53,7 @@ const double GPS_L1_FREQ_HZ = FREQ1;                //!< L1 [Hz]
 const double GPS_L1_CA_CODE_RATE_HZ = 1.023e6;      //!< GPS L1 C/A code rate [chips/s]
 const double GPS_L1_CA_CODE_LENGTH_CHIPS = 1023.0;  //!< GPS L1 C/A code length [chips]
 const double GPS_L1_CA_CODE_PERIOD = 0.001;         //!< GPS L1 C/A code period [seconds]
+const unsigned int GPS_L1_CA_CODE_PERIOD_MS = 1;    //!< GPS L1 C/A code period [ms]
 const double GPS_L1_CA_CHIP_PERIOD = 9.7752e-07;    //!< GPS L1 C/A chip period [seconds]
 
 /*!