diff --git a/src/utils/envelope.c b/src/utils/envelope.c
index 53d67b5..818d64b 100644
--- a/src/utils/envelope.c
+++ b/src/utils/envelope.c
@@ -1,5 +1,5 @@
 /*
- * Filename:    envelope.h
+ * Filename:    envelope.c
  *
  * Description:
  *
@@ -11,8 +11,6 @@
  *
  */
 #include "../common.h"
-#ifndef _H_ENVELOPE
-#define _H_ENVELOPE
 #include <stdbool.h>
 #include <stdlib.h>
 
@@ -160,5 +158,3 @@ Envelope* envelope_new() {
     e->min_level = 0.0f;
     return e;
 }
-
-#endif