diff --git a/tests/file_helper.cpp b/tests/file_helper.cpp
index f57ab707..5f3574d0 100644
--- a/tests/file_helper.cpp
+++ b/tests/file_helper.cpp
@@ -5,7 +5,7 @@
 
 using namespace spdlog::details;
 
-static const std::string filename = "logs/file_helper_test.txt";
+static const std::string target_filename = "logs/file_helper_test.txt";
 
 static void write_with_helper(file_helper &helper, size_t howmany)
 {
@@ -20,8 +20,8 @@ TEST_CASE("file_helper_filename", "[file_helper::filename()]]")
     prepare_logdir();
 
     file_helper helper(false);
-    helper.open(filename);
-    REQUIRE(helper.filename() == filename);
+    helper.open(target_filename);
+    REQUIRE(helper.filename() == target_filename);
 }
 
 
@@ -32,28 +32,28 @@ TEST_CASE("file_helper_size", "[file_helper::size()]]")
     auto expected_size = 123;
     {
         file_helper helper(true);
-        helper.open(filename);
+        helper.open(target_filename);
         write_with_helper(helper, expected_size);
         REQUIRE(helper.size() == expected_size);
     }
-    REQUIRE(get_filesize(filename) == expected_size);
+    REQUIRE(get_filesize(target_filename) == expected_size);
 }
 
 
 TEST_CASE("file_helper_exists", "[file_helper::file_exists()]]")
 {
     prepare_logdir();
-    REQUIRE(!file_helper::file_exists(filename));
+    REQUIRE(!file_helper::file_exists(target_filename));
     file_helper helper(false);
-    helper.open(filename);
-    REQUIRE(file_helper::file_exists(filename));
+    helper.open(target_filename);
+    REQUIRE(file_helper::file_exists(target_filename));
 }
 
 TEST_CASE("file_helper_reopen", "[file_helper::reopen()]]")
 {
     prepare_logdir();
     file_helper helper(true);
-    helper.open(filename);
+    helper.open(target_filename);
     write_with_helper(helper, 12);
     REQUIRE(helper.size() == 12);
     helper.reopen(true);
@@ -65,7 +65,7 @@ TEST_CASE("file_helper_reopen2", "[file_helper::reopen(false)]]")
     prepare_logdir();
     auto expected_size = 14;
     file_helper helper(true);
-    helper.open(filename);
+    helper.open(target_filename);
     write_with_helper(helper, expected_size);
     REQUIRE(helper.size() == expected_size);
     helper.reopen(false);
diff --git a/tests/utils.cpp b/tests/utils.cpp
index 83fdf84f..751ff820 100644
--- a/tests/utils.cpp
+++ b/tests/utils.cpp
@@ -4,10 +4,11 @@ void prepare_logdir()
 {
     spdlog::drop_all();
 #ifdef _WIN32
-    system("del /F /Q logs\\*");
+    auto rv = system("del /F /Q logs\\*");
 #else
-    system("rm -f logs/*");
+    auto rv = system("rm -f logs/*");
 #endif
+    (void)rv;
 }
 
 
@@ -42,4 +43,3 @@ std::size_t get_filesize(const std::string& filename)
 
     return ifs.tellg();
 }
-