diff --git a/include/libev.h b/include/libev.h
index fe6b7cc..41672ee 100644
--- a/include/libev.h
+++ b/include/libev.h
@@ -11,6 +11,11 @@
  *  @copyright 2015 Copernica BV
  */
 
+/**
+ *  Include guard
+ */
+#pragma once
+
 /**
  *  Set up namespace
  */