diff --git a/src/algorithms/PVT/libs/pvt_conf.cc b/src/algorithms/PVT/libs/pvt_conf.cc
index 80b3232a1..75779ca44 100644
--- a/src/algorithms/PVT/libs/pvt_conf.cc
+++ b/src/algorithms/PVT/libs/pvt_conf.cc
@@ -29,7 +29,7 @@ Pvt_Conf::Pvt_Conf()
     max_obs_block_rx_clock_offset_ms = 40;
     rinex_version = 0;
     rinexobs_rate_ms = 0;
-    rinex_name = "-";
+    rinex_name = std::string("-");
 
     dump = false;
     dump_mat = true;
diff --git a/src/algorithms/acquisition/libs/acq_conf.cc b/src/algorithms/acquisition/libs/acq_conf.cc
index 58cbf29c7..f3f75465f 100644
--- a/src/algorithms/acquisition/libs/acq_conf.cc
+++ b/src/algorithms/acquisition/libs/acq_conf.cc
@@ -44,10 +44,9 @@ Acq_Conf::Acq_Conf()
     dump = false;
     blocking = true;
     make_2_steps = false;
-    dump_filename = "";
     dump_channel = 0U;
     it_size = sizeof(gr_complex);
-    item_type = "gr_complex";
+    item_type = std::string("gr_complex");
     blocking_on_standby = false;
     use_automatic_resampler = false;
     resampler_ratio = 1.0;
diff --git a/src/algorithms/observables/libs/obs_conf.cc b/src/algorithms/observables/libs/obs_conf.cc
index 5e6b8ae7e..9dbadf9c7 100644
--- a/src/algorithms/observables/libs/obs_conf.cc
+++ b/src/algorithms/observables/libs/obs_conf.cc
@@ -20,7 +20,7 @@
 
 Obs_Conf::Obs_Conf()
 {
-    dump_filename = "obs_dump.dat";
+    dump_filename = std::string("obs_dump.dat");
     smoothing_factor = FLAGS_carrier_smoothing_factor;
     nchannels_in = 0;
     nchannels_out = 0;
diff --git a/src/algorithms/tracking/libs/dll_pll_conf.cc b/src/algorithms/tracking/libs/dll_pll_conf.cc
index 33da12bf9..21124543e 100644
--- a/src/algorithms/tracking/libs/dll_pll_conf.cc
+++ b/src/algorithms/tracking/libs/dll_pll_conf.cc
@@ -69,7 +69,7 @@ Dll_Pll_Conf::Dll_Pll_Conf()
     signal[0] = '1';
     signal[1] = 'C';
     signal[2] = '\0';
-    item_type = "gr_complex";
+    item_type = std::string("gr_complex");
 }
 
 
diff --git a/src/algorithms/tracking/libs/dll_pll_conf_fpga.cc b/src/algorithms/tracking/libs/dll_pll_conf_fpga.cc
index 5f6e5a098..7d82a7f01 100644
--- a/src/algorithms/tracking/libs/dll_pll_conf_fpga.cc
+++ b/src/algorithms/tracking/libs/dll_pll_conf_fpga.cc
@@ -71,7 +71,7 @@ Dll_Pll_Conf_Fpga::Dll_Pll_Conf_Fpga()
     signal[0] = '1';
     signal[1] = 'C';
     signal[2] = '\0';
-    device_name = "/dev/uio";
+    device_name = std::string("/dev/uio");
     code_length_chips = 0U;
     code_samples_per_chip = 0U;
     ca_codes = nullptr;