diff --git a/perfmap.go b/perfmap.go
index 749c105..d5eb755 100644
--- a/perfmap.go
+++ b/perfmap.go
@@ -264,6 +264,8 @@ func (m *PerfMap) Resume() error {
 
 // BufferSize is the size in bytes of each per-CPU buffer
 func (m *PerfMap) BufferSize() int {
+	m.stateLock.Lock()
+	defer m.stateLock.Unlock()
 	return m.bufferSize
 }
 
diff --git a/ringbuffer.go b/ringbuffer.go
index 89713f3..03777a4 100644
--- a/ringbuffer.go
+++ b/ringbuffer.go
@@ -185,6 +185,8 @@ func (rb *RingBuffer) Stop(cleanup MapCleanupType) error {
 
 // BufferSize returns the size in bytes of the ring buffer
 func (rb *RingBuffer) BufferSize() int {
+	rb.stateLock.Lock()
+	defer rb.stateLock.Unlock()
 	return rb.bufferSize
 }