diff --git a/AK/Queue.h b/AK/Queue.h
index 7d672545723..f686fab6e07 100644
--- a/AK/Queue.h
+++ b/AK/Queue.h
@@ -38,7 +38,7 @@ public:
     Queue() { }
     ~Queue() { }
 
-    int size() const { return m_size; }
+    size_t size() const { return m_size; }
     bool is_empty() const { return m_size == 0; }
 
     void enqueue(T&& value)
@@ -81,8 +81,8 @@ public:
 
 private:
     SinglyLinkedList<OwnPtr<Vector<T, segment_size>>> m_segments;
-    int m_index_into_first { 0 };
-    int m_size { 0 };
+    size_t m_index_into_first { 0 };
+    size_t m_size { 0 };
 };
 
 }
diff --git a/Applications/Piano/AudioEngine.cpp b/Applications/Piano/AudioEngine.cpp
index e3b8d5c4347..50a7f57ce8f 100644
--- a/Applications/Piano/AudioEngine.cpp
+++ b/Applications/Piano/AudioEngine.cpp
@@ -107,7 +107,7 @@ void AudioEngine::fill_buffer(FixedArray<Sample>& buffer)
     }
 
     if (m_delay) {
-        if (m_delay_buffers.size() >= m_delay) {
+        if (m_delay_buffers.size() >= static_cast<size_t>(m_delay)) {
             auto to_blend = m_delay_buffers.dequeue();
             for (size_t i = 0; i < to_blend->size(); ++i) {
                 buffer[i].left += (*to_blend)[i].left * 0.333333;