diff --git a/include/arduino-nano/driver/stdout.h b/include/arduino-nano/driver/stdout.h
index d6cb2b083df86c2f5760d98079b2e9fa6be52559..2eb669df7ddf3976c429bebdde61ee6e177ed9a0 100644
--- a/include/arduino-nano/driver/stdout.h
+++ b/include/arduino-nano/driver/stdout.h
@@ -1,5 +1,5 @@
 #ifndef STANDARDOUTPUT_H
-#define STANDANDOUTPUT_H
+#define STANDARDOUTPUT_H
 
 #include "object/outputstream.h"
 
diff --git a/include/esp8266/driver/stdout.h b/include/esp8266/driver/stdout.h
index e3d6baaf782011054d58122e4204f7421abdd5fd..5a750967214ddf9c1c0b13053469482072d9cc77 100644
--- a/include/esp8266/driver/stdout.h
+++ b/include/esp8266/driver/stdout.h
@@ -1,5 +1,5 @@
 #ifndef STANDARDOUTPUT_H
-#define STANDANDOUTPUT_H
+#define STANDARDOUTPUT_H
 
 class StandardOutput {
 	private:
diff --git a/include/msp430fr5969lp/driver/stdout.h b/include/msp430fr5969lp/driver/stdout.h
index d6cb2b083df86c2f5760d98079b2e9fa6be52559..2eb669df7ddf3976c429bebdde61ee6e177ed9a0 100644
--- a/include/msp430fr5969lp/driver/stdout.h
+++ b/include/msp430fr5969lp/driver/stdout.h
@@ -1,5 +1,5 @@
 #ifndef STANDARDOUTPUT_H
-#define STANDANDOUTPUT_H
+#define STANDARDOUTPUT_H
 
 #include "object/outputstream.h"
 
diff --git a/include/posix/driver/stdout.h b/include/posix/driver/stdout.h
index cf8d8812ef645f62737d9bf0d15fa636cec4b1fa..b21ad56de062dd43918b33867d819e62c22414dc 100644
--- a/include/posix/driver/stdout.h
+++ b/include/posix/driver/stdout.h
@@ -1,5 +1,5 @@
 #ifndef STANDARDOUTPUT_H
-#define STANDANDOUTPUT_H
+#define STANDARDOUTPUT_H
 
 #include "object/outputstream.h"