diff --git a/strutils.h b/strutils.h
index a5cf201..fc77e5b 100644
--- a/strutils.h
+++ b/strutils.h
@@ -32,7 +32,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 #ifndef __STRUTILS_H__
-#define __STRUTILS_H___
+#define __STRUTILS_H__
 
 #include <stdint.h>
 #include <time.h>