diff --git a/include/mraa_internal_types.h b/include/mraa_internal_types.h
index 39e3903..effd29c 100644
--- a/include/mraa_internal_types.h
+++ b/include/mraa_internal_types.h
@@ -69,3 +69,11 @@ struct _pwm {
     mraa_boolean_t owner; /**< Owner of pwm context*/
     /*@}*/
 };
+
+/**
+ * A structure representing a Analog Input Channel
+ */
+struct _aio {
+    unsigned int channel; /**< the channel as on board and ADC module */
+    int adc_in_fp; /**< File Pointer to raw sysfs */
+};
diff --git a/src/aio/aio.c b/src/aio/aio.c
index 7a171d0..aab97b7 100644
--- a/src/aio/aio.c
+++ b/src/aio/aio.c
@@ -29,11 +29,6 @@
 #include "aio.h"
 #include "mraa_internal.h"
 
-struct _aio {
-    unsigned int channel;
-    int adc_in_fp;
-};
-
 static int raw_bits;
 static int sup_bits;