diff --git a/seriell/input.c b/seriell/input.c
index 82b079a..f1ce03b 100644
--- a/seriell/input.c
+++ b/seriell/input.c
@@ -32,6 +32,8 @@
 #include <sys/types.h>
 #include <poll.h>           /* Polling */
 
+#include "input.h"
+#include "process.h"
 #include "config.h"
 #include "definitions.h"
 #include "main.h"
diff --git a/seriell/input.h b/seriell/input.h
index 56bd802..0c29222 100644
--- a/seriell/input.h
+++ b/seriell/input.h
@@ -24,5 +24,7 @@
 */
 
 
-/*Funktionen*/
-int read_port(int);
+/* Funktionen */
+
+/* Schnittstelle öffnen + lesen */
+int read_port();
diff --git a/seriell/main.c b/seriell/main.c
index df834a1..51337ea 100644
--- a/seriell/main.c
+++ b/seriell/main.c
@@ -33,6 +33,7 @@
 #include "definitions.h"
 #include "config.h"
 #include "main.h"
+#include "input.h"
 
 /* Variablen ---------------------------------------------------------- */
 w_opts global_opts;
diff --git a/seriell/process.c b/seriell/process.c
index c740c00..72369ad 100644
--- a/seriell/process.c
+++ b/seriell/process.c
@@ -29,6 +29,7 @@
 #include <time.h>
 #include <sys/types.h>
 #include <string.h>
+#include "process.h"
 #include "main.h"
 #include "definitions.h"
 #include "config.h"