diff --git a/src/tests/gnss_block/file_output_filter_test.cc b/src/tests/gnss_block/file_output_filter_test.cc
index 3b28d7bda..9a141a69a 100644
--- a/src/tests/gnss_block/file_output_filter_test.cc
+++ b/src/tests/gnss_block/file_output_filter_test.cc
@@ -16,7 +16,7 @@
  * GNSS-SDR is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
- * at your option) any later version.
+ * (at your option) any later version.
  *
  * GNSS-SDR is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -41,7 +41,7 @@ TEST(FileOutputFilter, Instantiate)
     config->set_property("Test.filename", file);
     config->set_property("Test.item_type", "float");
     std::unique_ptr<FileOutputFilter> output_filter(new FileOutputFilter(config.get(), "Test", 1, 0));
-    unsigned int res = 0;
+    int res = 0;
     if (output_filter) res = 1;
     ASSERT_EQ(1, res);
 }
diff --git a/src/tests/gnss_block/fir_filter_test.cc b/src/tests/gnss_block/fir_filter_test.cc
index 64adc4342..5ea26261b 100644
--- a/src/tests/gnss_block/fir_filter_test.cc
+++ b/src/tests/gnss_block/fir_filter_test.cc
@@ -93,7 +93,7 @@ TEST_F(Fir_Filter_Test, Instantiate)
 {
     init();
     std::unique_ptr<FirFilter> filter(new FirFilter(config.get(), "InputFilter", 1, 1, queue));
-    unsigned int res = 0;
+    int res = 0;
     if (filter) res = 1;
     ASSERT_EQ(1, res);
 }