diff --git a/src/ConfigMain.cpp b/src/ConfigMain.cpp
index 3e2efbe..34b2e82 100644
--- a/src/ConfigMain.cpp
+++ b/src/ConfigMain.cpp
@@ -18,6 +18,7 @@
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <iostream>
+#include <utility>
 #include <stdlib.h>
 #include <unistd.h>
 #include "CommandLineParser.hpp"
@@ -603,7 +604,7 @@ void SetVarPermissions(
     using namespace std::filesystem;
     try {
         if (fs::exists(path)) {
-            chown(path.c_str(),uid,gid);
+            std::ignore = chown(path.c_str(),uid,gid);
             if (fs::is_directory(path)) {
                 fs::permissions(path, directoryPermissions, fs::perm_options::replace);
                 for (const auto& entry : fs::recursive_directory_iterator(path)) {
diff --git a/src/InvertingMutexTest.cpp b/src/InvertingMutexTest.cpp
index 626676b..da4ac5a 100644
--- a/src/InvertingMutexTest.cpp
+++ b/src/InvertingMutexTest.cpp
@@ -22,6 +22,7 @@
 #include <sstream>
 #include <cstdint>
 #include <string>
+#include <utility>
 
 #include "json.hpp"
 #include "json_variant.hpp"
@@ -46,7 +47,7 @@ TEST_CASE("inverting_mutext test", "[inverting_mutex_test]")
         std::thread thread(
             [&mutex]() mutable
             {
-                nice(5);
+                std::ignore = nice(5);
                 {
                     std::lock_guard<inverting_mutex> lock(mutex);
                     SetThreadName("imTest");
diff --git a/src/MimeTypes.cpp b/src/MimeTypes.cpp
index 637df49..12adde9 100644
--- a/src/MimeTypes.cpp
+++ b/src/MimeTypes.cpp
@@ -19,6 +19,7 @@
 
 
 #include "MimeTypes.hpp"
+#include "ss.hpp"
 
 using namespace pipedal;
 
@@ -136,7 +137,7 @@ static std::string toLower(const std::string&value)
 
 void MimeTypes::AddMimeType(const std::string&extension_, const std::string&mimeType)
 {
-    std::string extension = std::string(".") + toLower(extension_);
+    std::string extension = SS("." << toLower(extension_));
     mimeTypeToExtension[mimeType] = extension;
     extensionToMimeType[extension] = mimeType;
     if (mimeType.starts_with("audio/"))
diff --git a/src/Worker.cpp b/src/Worker.cpp
index 7e30685..6f14779 100644
--- a/src/Worker.cpp
+++ b/src/Worker.cpp
@@ -39,7 +39,8 @@
 #include <lv2/lv2plug.in/ns/ext/worker/worker.h>
 #include "Lv2Log.hpp"
 #include <iostream>
-#include <unistd.h> // for nice()
+#include <unistd.h> // for nice(
+#include <utility>
 #include "util.hpp"
 
 using namespace pipedal;
@@ -190,7 +191,7 @@ void HostWorkerThread::ThreadProc() noexcept
     // run nice +2 (priority -2 on Windows)
     SetThreadName("lv2_worker");
     errno = 0;
-    (void)nice(2);
+    std::ignore = nice(2);
     if (errno != 0)
     {
         std::cout << "Warning: Unable to run Lv2 schedule thread at nice +1" << std::endl;