diff --git a/src/WavWriter/WavWriter.h b/src/WavWriter/WavWriter.h
index 0b14243..a172c57 100644
--- a/src/WavWriter/WavWriter.h
+++ b/src/WavWriter/WavWriter.h
@@ -10,6 +10,7 @@
  * Author:      Rachel Fae Fox (foxiepaws),fox@foxiepa.ws
  *
  */
+#pragma once
 #include <cstdint>
 #include <cstdio>