diff --git a/include/lo2s/perf/event.hpp b/include/lo2s/perf/event.hpp
index 4d029576..eca39bba 100644
--- a/include/lo2s/perf/event.hpp
+++ b/include/lo2s/perf/event.hpp
@@ -230,7 +230,7 @@ class EventGuard
     EventGuard(Event& ev, std::variant<Cpu, Thread> location, int group_fd, int cgroup_fd);
 
     EventGuard() = delete;
-    EventGuard(EventGuard&) = delete;
+    EventGuard(const EventGuard& other) = delete;
     EventGuard& operator=(const EventGuard&) = delete;
 
     EventGuard(EventGuard&& other)
diff --git a/include/lo2s/perf/io_reader.hpp b/include/lo2s/perf/io_reader.hpp
index 58cac340..98797ca2 100644
--- a/include/lo2s/perf/io_reader.hpp
+++ b/include/lo2s/perf/io_reader.hpp
@@ -93,11 +93,11 @@ struct IoReaderIdentity
 class IoReader : public PullReader
 {
 public:
-    IoReader(IoReaderIdentity identity) : identity_(identity)
+    IoReader(IoReaderIdentity identity) : identity_(identity), event_(std::nullopt)
     {
         try
         {
-            event_ = std::move(identity_.tracepoint.open(identity.cpu));
+            event_ = identity_.tracepoint.open(identity.cpu);
         }
         catch (const std::system_error& e)
         {
diff --git a/include/lo2s/perf/sample/reader.hpp b/include/lo2s/perf/sample/reader.hpp
index e8eda7b0..2b818226 100644
--- a/include/lo2s/perf/sample/reader.hpp
+++ b/include/lo2s/perf/sample/reader.hpp
@@ -90,7 +90,7 @@ class Reader : public EventReader<T>
         {
             try
             {
-                event_ = std::move(event.open(scope, config().cgroup_fd));
+                event_ = event.open(scope, config().cgroup_fd);
             }
             catch (const std::system_error& e)
             {
diff --git a/src/perf/counter/group/reader.cpp b/src/perf/counter/group/reader.cpp
index a4a36bd3..f65994f8 100644
--- a/src/perf/counter/group/reader.cpp
+++ b/src/perf/counter/group/reader.cpp
@@ -66,8 +66,8 @@ Reader<T>::Reader(ExecutionScope scope, bool enable_on_exec)
     {
         try
         {
-            counter_leader_ = std::move(
-                counter_collection_.leader.open_as_group_leader(scope, config().cgroup_fd));
+            counter_leader_ =
+                counter_collection_.leader.open_as_group_leader(scope, config().cgroup_fd);
         }
         catch (const std::system_error& e)
         {
@@ -95,7 +95,7 @@ Reader<T>::Reader(ExecutionScope scope, bool enable_on_exec)
     {
         if (counter_ev.is_available_in(scope))
         {
-            std::optional<EventGuard> counter;
+            std::optional<EventGuard> counter = std::nullopt;
             counter_ev.mut_attr().exclude_kernel = counter_collection_.leader.attr().exclude_kernel;
             do
             {
diff --git a/src/perf/counter/userspace/reader.cpp b/src/perf/counter/userspace/reader.cpp
index 27b13d68..c1a6bfdc 100644
--- a/src/perf/counter/userspace/reader.cpp
+++ b/src/perf/counter/userspace/reader.cpp
@@ -66,11 +66,11 @@ Reader<T>::Reader(ExecutionScope scope)
 
     for (auto& event : counter_collection_.counters)
     {
-        std::optional<EventGuard> counter;
+        std::optional<EventGuard> counter = std::nullopt;
 
         try
         {
-            counter = std::move(event.open(scope));
+            counter = event.open(scope);
             counters_.emplace_back(std::move(counter.value()));
         }
         catch (const std::system_error& e)
@@ -82,7 +82,7 @@ Reader<T>::Reader(ExecutionScope scope)
                 event.mut_attr().exclude_kernel = 1;
                 perf_warn_paranoid();
 
-                counter = std::move(event.open(scope));
+                counter = event.open(scope);
             }
 
             if (!counter.value().is_valid())
diff --git a/src/perf/time/reader.cpp b/src/perf/time/reader.cpp
index 723fa8a6..ba6404d2 100644
--- a/src/perf/time/reader.cpp
+++ b/src/perf/time/reader.cpp
@@ -61,7 +61,7 @@ Reader::Reader()
 
     try
     {
-        ev_instance_ = std::move(event.open(Thread(0)));
+        ev_instance_ = event.open(Thread(0));
 
         init_mmap(ev_instance_.value().get_fd());
         ev_instance_.value().enable();