diff --git a/benchmark/benchmarker.h b/benchmark/benchmarker.h
index d93c2a45..471ba718 100644
--- a/benchmark/benchmarker.h
+++ b/benchmark/benchmarker.h
@@ -241,7 +241,7 @@ const char* benchmark_stage_name(BenchmarkStage stage) {
 
 struct benchmarker {
   // JSON text from loading the file. Owns the memory.
-  padded_string json;
+  padded_string json{};
   // JSON filename
   const char *filename;
   // Event collector that can be turned on to measure cycles, missed branches, etc.
@@ -251,15 +251,15 @@ struct benchmarker {
   // Loaded on first parse.
   json_stats* stats;
   // Speed and event summary for full parse (not including allocation)
-  event_aggregate all_stages;
+  event_aggregate all_stages{};
   // Speed and event summary for stage 1
-  event_aggregate stage1;
+  event_aggregate stage1{};
   // Speed and event summary for stage 2
-  event_aggregate stage2;
+  event_aggregate stage2{};
   // Speed and event summary for allocation
-  event_aggregate allocate_stage;
+  event_aggregate allocate_stage{};
   // Speed and event summary for the repeatly-parsing mode
-  event_aggregate loop;
+  event_aggregate loop{};
 
   benchmarker(const char *_filename, event_collector& _collector)
     : filename(_filename), collector(_collector), stats(NULL) {
@@ -278,6 +278,9 @@ struct benchmarker {
     }
   }
 
+  benchmarker(const benchmarker&) = delete;
+  benchmarker& operator=(const benchmarker&) = delete;
+
   const event_aggregate& operator[](BenchmarkStage stage) const {
     switch (stage) {
       case BenchmarkStage::ALL: return this->all_stages;
diff --git a/benchmark/event_counter.h b/benchmark/event_counter.h
index 023d1be1..c10aa84a 100644
--- a/benchmark/event_counter.h
+++ b/benchmark/event_counter.h
@@ -84,9 +84,9 @@ struct event_count {
 
 struct event_aggregate {
   int iterations = 0;
-  event_count total;
-  event_count best;
-  event_count worst;
+  event_count total{};
+  event_count best{};
+  event_count worst{};
 
   event_aggregate() {}
 
@@ -111,8 +111,8 @@ struct event_aggregate {
 };
 
 struct event_collector {
-  event_count count;
-  time_point<steady_clock> start_clock;
+  event_count count{};
+  time_point<steady_clock> start_clock{};
 
 #if defined(__linux__)
   LinuxEvents<PERF_TYPE_HARDWARE> linux_events;
@@ -149,4 +149,4 @@ struct event_collector {
   }
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/benchmark/linux/linux-perf-events.h b/benchmark/linux/linux-perf-events.h
index 4c40eb04..0f411e0e 100644
--- a/benchmark/linux/linux-perf-events.h
+++ b/benchmark/linux/linux-perf-events.h
@@ -17,10 +17,10 @@
 template <int TYPE = PERF_TYPE_HARDWARE> class LinuxEvents {
   int fd;
   bool working;
-  perf_event_attr attribs;
-  size_t num_events;
-  std::vector<uint64_t> temp_result_vec;
-  std::vector<uint64_t> ids;
+  perf_event_attr attribs{};
+  size_t num_events{};
+  std::vector<uint64_t> temp_result_vec{};
+  std::vector<uint64_t> ids{};
 
 public:
   explicit LinuxEvents(std::vector<int> config_vec) : fd(0), working(true) {
diff --git a/benchmark/parse.cpp b/benchmark/parse.cpp
index c933793f..ec6efc64 100644
--- a/benchmark/parse.cpp
+++ b/benchmark/parse.cpp
@@ -78,7 +78,7 @@ void exit_usage(string message) {
 }
 
 struct option_struct {
-  vector<char*> files;
+  vector<char*> files{};
   bool stage1_only = false;
 
   int32_t iterations = 200;
diff --git a/include/simdjson/implementation.h b/include/simdjson/implementation.h
index 9eb8d60b..f0a32c32 100644
--- a/include/simdjson/implementation.h
+++ b/include/simdjson/implementation.h
@@ -214,7 +214,7 @@ public:
   operator T*() { return ptr.load(); }
   T& operator*() { return *ptr; }
   T* operator->() { return ptr.load(); }
-  T* operator=(T *_ptr) { return ptr = _ptr; }
+  atomic_ptr& operator=(T *_ptr) { ptr = _ptr; return *this; }
 
 private:
   std::atomic<T*> ptr;
diff --git a/tools/minify.cpp b/tools/minify.cpp
index 2748904e..d1c7118f 100644
--- a/tools/minify.cpp
+++ b/tools/minify.cpp
@@ -32,7 +32,7 @@ void exit_usage(std::string message) {
 
 
 struct option_struct {
-  char* filename;
+  char* filename{};
  
   option_struct(int argc, char **argv) {
     #ifndef _MSC_VER