diff --git a/src/core/libs/INIReader.cc b/src/core/libs/INIReader.cc
index 440a1fd75..c7eb2a073 100644
--- a/src/core/libs/INIReader.cc
+++ b/src/core/libs/INIReader.cc
@@ -33,8 +33,8 @@
 
 
 INIReader::INIReader(const std::string& filename)
+    : _error(ini_parse(filename.c_str(), ValueHandler, this))
 {
-    _error = ini_parse(filename.c_str(), ValueHandler, this);
 }
 
 
diff --git a/src/core/libs/channel_event.cc b/src/core/libs/channel_event.cc
index 818d25a7d..b23b004da 100644
--- a/src/core/libs/channel_event.cc
+++ b/src/core/libs/channel_event.cc
@@ -22,7 +22,7 @@ channel_event_sptr channel_event_make(int channel_id, int event_type)
 }
 
 Channel_Event::Channel_Event(int channel_id_, int event_type_)
+    : channel_id(channel_id_),
+      event_type(event_type_)
 {
-    channel_id = channel_id_;
-    event_type = event_type_;
 }
diff --git a/src/core/libs/command_event.cc b/src/core/libs/command_event.cc
index 9a4cc539f..1f5bdfcfd 100644
--- a/src/core/libs/command_event.cc
+++ b/src/core/libs/command_event.cc
@@ -22,7 +22,7 @@ command_event_sptr command_event_make(int command_id, int event_type)
 }
 
 Command_Event::Command_Event(int command_id_, int event_type_)
+    : command_id(command_id_),
+      event_type(event_type_)
 {
-    command_id = command_id_;
-    event_type = event_type_;
 }
diff --git a/src/core/libs/gnss_sdr_fpga_sample_counter.cc b/src/core/libs/gnss_sdr_fpga_sample_counter.cc
index 57bd274ed..a36540e92 100644
--- a/src/core/libs/gnss_sdr_fpga_sample_counter.cc
+++ b/src/core/libs/gnss_sdr_fpga_sample_counter.cc
@@ -46,30 +46,31 @@
 
 gnss_sdr_fpga_sample_counter::gnss_sdr_fpga_sample_counter(
     double _fs,
-    int32_t _interval_ms) : gr::block("fpga_fpga_sample_counter",
-                                gr::io_signature::make(0, 0, 0),
-                                gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
+    int32_t _interval_ms)
+    : gr::block("fpga_fpga_sample_counter",
+          gr::io_signature::make(0, 0, 0),
+          gr::io_signature::make(1, 1, sizeof(Gnss_Synchro))),
+      fs(_fs),
+      sample_counter(0ULL),
+      last_sample_counter(0ULL),
+      current_T_rx_ms(0),
+      interval_ms(_interval_ms),
+      current_s(0),
+      current_m(0),
+      current_h(0),
+      current_days(0),
+      report_interval_ms(1000),     // default reporting 1 second
+      flag_enable_send_msg(false),  // enable it for reporting time with asynchronous message
+      flag_m(false),
+      flag_h(false),
+      flag_days(false),
+      is_open(true)
 {
     message_port_register_out(pmt::mp("fpga_sample_counter"));
     set_max_noutput_items(1);
-    interval_ms = _interval_ms;
-    fs = _fs;
     samples_per_output = std::round(fs * static_cast<double>(interval_ms) / 1e3);
-    open_device();
-    is_open = true;
-    sample_counter = 0ULL;
-    last_sample_counter = 0ULL;
-    current_T_rx_ms = 0;
-    current_s = 0;
-    current_m = 0;
-    current_h = 0;
-    current_days = 0;
-    report_interval_ms = 1000;  // default reporting 1 second
     samples_per_report = std::round(fs * static_cast<double>(report_interval_ms) / 1e3);
-    flag_enable_send_msg = false;  // enable it for reporting time with asynchronous message
-    flag_m = false;
-    flag_h = false;
-    flag_days = false;
+    open_device();
 }
 
 
diff --git a/src/core/libs/gnss_sdr_sample_counter.cc b/src/core/libs/gnss_sdr_sample_counter.cc
index 05ff03745..8a607ba50 100644
--- a/src/core/libs/gnss_sdr_sample_counter.cc
+++ b/src/core/libs/gnss_sdr_sample_counter.cc
@@ -31,27 +31,28 @@
 gnss_sdr_sample_counter::gnss_sdr_sample_counter(
     double _fs,
     int32_t _interval_ms,
-    size_t _size) : gr::sync_decimator("sample_counter",
-                        gr::io_signature::make(1, 1, _size),
-                        gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
-                        static_cast<uint32_t>(std::round(_fs * static_cast<double>(_interval_ms) / 1e3)))
+    size_t _size)
+    : gr::sync_decimator("sample_counter",
+          gr::io_signature::make(1, 1, _size),
+          gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
+          static_cast<uint32_t>(std::round(_fs * static_cast<double>(_interval_ms) / 1e3))),
+      fs(_fs),
+      current_T_rx_ms(0),
+      sample_counter(0),
+      interval_ms(_interval_ms),
+      report_interval_ms(1000),  // default reporting 1 second
+      samples_per_output(std::round(fs * static_cast<double>(interval_ms) / 1e3)),
+      current_s(0),
+      current_m(0),
+      current_h(0),
+      current_days(0),
+      flag_m(false),
+      flag_h(false),
+      flag_days(false),
+      flag_enable_send_msg(false)  // enable it for reporting time with asynchronous message
 {
     message_port_register_out(pmt::mp("sample_counter"));
     set_max_noutput_items(1);
-    interval_ms = _interval_ms;
-    fs = _fs;
-    samples_per_output = std::round(fs * static_cast<double>(interval_ms) / 1e3);
-    sample_counter = 0;
-    current_T_rx_ms = 0;
-    current_s = 0;
-    current_m = 0;
-    current_h = 0;
-    current_days = 0;
-    report_interval_ms = 1000;     // default reporting 1 second
-    flag_enable_send_msg = false;  // enable it for reporting time with asynchronous message
-    flag_m = false;
-    flag_h = false;
-    flag_days = false;
     set_tag_propagation_policy(TPP_DONT);  // no tag propagation, the time tag will be adjusted and regenerated in work()
 }
 
diff --git a/src/core/libs/gnss_sdr_supl_client.cc b/src/core/libs/gnss_sdr_supl_client.cc
index d09b3c099..10dda2be4 100644
--- a/src/core/libs/gnss_sdr_supl_client.cc
+++ b/src/core/libs/gnss_sdr_supl_client.cc
@@ -31,15 +31,10 @@
 #include <vector>
 
 Gnss_Sdr_Supl_Client::Gnss_Sdr_Supl_Client()
+    : server_port(0), request(0), mcc(0), mns(0), lac(0), ci(0)
 {
-    mcc = 0;
-    mns = 0;
-    lac = 0;
-    ci = 0;
     supl_ctx_new(&ctx);
     assist = supl_assist_t();
-    server_port = 0;
-    request = 0;
 }
 
 
diff --git a/src/core/libs/gnss_sdr_time_counter.cc b/src/core/libs/gnss_sdr_time_counter.cc
index 434f9aad9..06d87f2fa 100644
--- a/src/core/libs/gnss_sdr_time_counter.cc
+++ b/src/core/libs/gnss_sdr_time_counter.cc
@@ -21,20 +21,21 @@
 #include <iostream>
 #include <string>
 
-gnss_sdr_time_counter::gnss_sdr_time_counter() : gr::block("time_counter",
-                                                     gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
-                                                     gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
+gnss_sdr_time_counter::gnss_sdr_time_counter()
+    : gr::block("time_counter",
+          gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
+          gr::io_signature::make(1, 1, sizeof(Gnss_Synchro))),
+      current_T_rx_ms(0),
+      report_interval_ms(1000),  // default reporting 1 second
+      current_s(0),
+      current_m(0),
+      current_h(0),
+      current_days(0),
+      flag_m(false),
+      flag_h(false),
+      flag_days(false)
 {
     set_max_noutput_items(1);
-    current_T_rx_ms = 0;
-    current_s = 0;
-    current_m = 0;
-    current_h = 0;
-    current_days = 0;
-    report_interval_ms = 1000;  // default reporting 1 second
-    flag_m = false;
-    flag_h = false;
-    flag_days = false;
 }