diff --git a/lib/ethosu_profiler/src/ethosu_profiler.cpp b/lib/ethosu_profiler/src/ethosu_profiler.cpp
index bf4aae7..50b65f0 100644
--- a/lib/ethosu_profiler/src/ethosu_profiler.cpp
+++ b/lib/ethosu_profiler/src/ethosu_profiler.cpp
@@ -38,7 +38,7 @@
 
 namespace tflite {
 
-EthosUProfiler::EthosUProfiler(size_t max_events) : max_events_(max_events) {
+EthosUProfiler::EthosUProfiler(size_t max_events) : max_events_(max_events), num_events_(0) {
     tags_        = std::make_unique<const char *[]>(max_events_);
     start_ticks_ = std::make_unique<uint64_t[]>(max_events_);
     end_ticks_   = std::make_unique<uint64_t[]>(max_events_);
@@ -92,7 +92,8 @@
 
 uint64_t EthosUProfiler::GetTotalTicks() const {
     uint64_t ticks = 0;
-    for (int i = 0; i < num_events_; ++i) {
+
+    for (size_t i = 0; i < num_events_; ++i) {
         ticks += end_ticks_[i] - start_ticks_[i];
     }