diff --git a/include/arch/arduino-nano/driver/counter.h b/include/arch/arduino-nano/driver/counter.h
index c4fc447b909e461e5e8f8f51a00bdca8c610a9f3..c89fb44e3852b041dadbfcc3023f631c5e976982 100644
--- a/include/arch/arduino-nano/driver/counter.h
+++ b/include/arch/arduino-nano/driver/counter.h
@@ -1,3 +1,6 @@
+#ifndef COUNTER_H
+#define COUNTER_H
+
 #include <avr/io.h>
 #include <avr/interrupt.h>
 
@@ -29,3 +32,5 @@ class Counter {
 };
 
 extern Counter counter;
+
+#endif
diff --git a/include/arch/msp430fr5994lp/driver/counter.h b/include/arch/msp430fr5994lp/driver/counter.h
index 61f0ec17921a8171ae46256d5534a16b021fc0fd..b95aba112a69e59692e2620dda18bbb933abe6f1 100644
--- a/include/arch/msp430fr5994lp/driver/counter.h
+++ b/include/arch/msp430fr5994lp/driver/counter.h
@@ -1,3 +1,6 @@
+#ifndef COUNTER_H
+#define COUNTER_H
+
 #include <msp430.h>
 #include <stdint.h>
 
@@ -28,3 +31,5 @@ class Counter {
 };
 
 extern Counter counter;
+
+#endif
diff --git a/include/arch/posix/driver/counter.h b/include/arch/posix/driver/counter.h
index 88cb0cc005edcb49591567b6696c071e144eaf64..eeb6da45733a2cdd9e0a9bb2b8bd6d5e4f76df25 100644
--- a/include/arch/posix/driver/counter.h
+++ b/include/arch/posix/driver/counter.h
@@ -1,3 +1,6 @@
+#ifndef COUNTER_H
+#define COUNTER_H
+
 #include <stdint.h>
 #include <time.h>
 
@@ -32,3 +35,5 @@ class Counter {
 };
 
 extern Counter counter;
+
+#endif