diff --git a/src/tests/gnss_block/fir_filter_test.cc b/src/tests/gnss_block/fir_filter_test.cc
index 4c3436385..647b4d76d 100644
--- a/src/tests/gnss_block/fir_filter_test.cc
+++ b/src/tests/gnss_block/fir_filter_test.cc
@@ -43,8 +43,7 @@
 #include "gnss_sdr_valve.h"
 #include "fir_filter.h"
 
-DEFINE_string(filter_test_output_filename, "../src/tests/data/fir_filter_test_output.dat", "Dump filename")
-;
+DEFINE_string(filter_test_output_filename, "../src/tests/data/fir_filter_test_output.dat", "Dump filename");
 
 class Fir_Filter_Test: public ::testing::Test {
 protected:
@@ -105,8 +104,8 @@ TEST_F(Fir_Filter_Test, ConnectAndRun)
 	int fs_in = 8000000;
 	int nsamples = 10000000;
 	struct timeval tv;
-    long long int begin;
-    long long int end;
+    long long int begin = 0;
+    long long int end = 0;
 
     init();
 
diff --git a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc
index d9c10c0b7..8b8abe756 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc
@@ -152,8 +152,8 @@ TEST_F(GalileoE1PcpsAmbiguousAcquisitionGSoCTest, ConnectAndRun)
 	int fs_in = 4000000;
 	int nsamples = 4*fs_in;
 	struct timeval tv;
-    long long int begin;
-    long long int end;
+    long long int begin = 0;
+    long long int end = 0;
 
     init();
 	GalileoE1PcpsAmbiguousAcquisition *acquisition = new GalileoE1PcpsAmbiguousAcquisition(config, "Acquisition", 1, 1, queue);
@@ -184,8 +184,8 @@ TEST_F(GalileoE1PcpsAmbiguousAcquisitionGSoCTest, ConnectAndRun)
 TEST_F(GalileoE1PcpsAmbiguousAcquisitionGSoCTest, ValidationOfResults)
 {
 	struct timeval tv;
-    long long int begin;
-    long long int end;
+    long long int begin = 0;
+    long long int end = 0;
 
     init();
 	GalileoE1PcpsAmbiguousAcquisition *acquisition = new GalileoE1PcpsAmbiguousAcquisition(config, "Acquisition", 1, 1, queue);
diff --git a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc
index bdad59f4a..ce8439c66 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc
@@ -142,8 +142,8 @@ TEST_F(GalileoE1PcpsAmbiguousAcquisitionTest, ConnectAndRun)
 	int fs_in = 4000000;
 	int nsamples = 4*fs_in;
 	struct timeval tv;
-    long long int begin;
-    long long int end;
+    long long int begin = 0;
+    long long int end = 0;
 
     init();
 	GalileoE1PcpsAmbiguousAcquisition *acquisition = new GalileoE1PcpsAmbiguousAcquisition(config, "Acquisition", 1, 1, queue);
@@ -174,8 +174,8 @@ TEST_F(GalileoE1PcpsAmbiguousAcquisitionTest, ConnectAndRun)
 TEST_F(GalileoE1PcpsAmbiguousAcquisitionTest, ValidationOfResults)
 {
 	struct timeval tv;
-    long long int begin;
-    long long int end;
+    long long int begin = 0;
+    long long int end = 0;
     double expected_delay_samples = 2920; //18250;
     double expected_doppler_hz = 632;
     init();
diff --git a/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc b/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc
index b23816bbf..1e2a8e380 100644
--- a/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc
+++ b/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc
@@ -141,8 +141,8 @@ TEST_F(GpsL1CaPcpsAcquisitionTest, ConnectAndRun)
 	int fs_in = 4000000;
 	int nsamples = 4000;
 	struct timeval tv;
-    long long int begin;
-    long long int end;
+    long long int begin = 0;
+    long long int end = 0;
 
     init();
 	GpsL1CaPcpsAcquisition *acquisition = new GpsL1CaPcpsAcquisition(config, "Acquisition", 1, 1, queue);
@@ -173,8 +173,8 @@ TEST_F(GpsL1CaPcpsAcquisitionTest, ConnectAndRun)
 TEST_F(GpsL1CaPcpsAcquisitionTest, ValidationOfResults)
 {
 	struct timeval tv;
-    long long int begin;
-    long long int end;
+    long long int begin = 0;
+    long long int end = 0;
     double expected_delay_samples = 524;
     double expected_doppler_hz = -1680;
     init();