diff --git a/evdev.hpp b/evdev.hpp
index 9efe14e..2cb1dde 100644
--- a/evdev.hpp
+++ b/evdev.hpp
@@ -20,7 +20,7 @@
 {
     void operator()(sd_event* event) const
     {
-        event = sd_event_unref(event);
+        sd_event_unref(event);
     }
 };
 using EventPtr = std::unique_ptr<sd_event, EventDeleter>;
@@ -30,7 +30,7 @@
 {
     void operator()(sd_event_source* eventSource) const
     {
-        eventSource = sd_event_source_unref(eventSource);
+        sd_event_source_unref(eventSource);
     }
 };
 using EventSourcePtr = std::unique_ptr<sd_event_source, EventSourceDeleter>;
diff --git a/file.hpp b/file.hpp
index 500d8be..bc970bf 100644
--- a/file.hpp
+++ b/file.hpp
@@ -25,7 +25,7 @@
      *
      *  @param[in] fd - File descriptor
      */
-    FileDescriptor(int fd) : fd(fd)
+    explicit FileDescriptor(int fd) : fd(fd)
     {
         // Nothing
     }