diff --git a/include/bit_ring.h b/include/bit_ring.h
index 2c2b81e..bd91263 100644
--- a/include/bit_ring.h
+++ b/include/bit_ring.h
@@ -1,4 +1,5 @@
-// bit_ring.h
+#pragma once
+
 #include <stdatomic.h>
 #include <stdlib.h>
 
diff --git a/include/vban.h b/include/vban.h
index 0b5b4ef..0f8c22b 100644
--- a/include/vban.h
+++ b/include/vban.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <pulse/simple.h>
 
 #define VBAN_SR_MAXNUMBER 21
diff --git a/lib/delay.h b/lib/delay.h
index 90f1763..8a6136f 100644
--- a/lib/delay.h
+++ b/lib/delay.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <string.h>
 #include <stdlib.h>
 #include <stdint.h>