1 files changed, 6 insertions, 3 deletions

diff --git a/src/include/gnunet_microphone_lib.h b/src/include/gnunet_microphone_lib.h
index c99777d0c..1ba97cdf6 100644
--- a/src/include/gnunet_microphone_lib.h
+++ b/src/include/gnunet_microphone_lib.h
@@ -36,6 +36,8 @@ extern "C"
 #endif
 #endif
 
+#include "gnunet_util_lib.h"
+
 /**
  * Process recorded audio data.
  *
@@ -53,10 +55,11 @@ typedef void (*GNUNET_MICROPHONE_RecordedDataCallback)(void *cls,
  * @param cls clsoure
  * @param rdc function to call with recorded data
  * @param rdc_cls closure for @a dc
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
  */
-typedef void (*GNUNET_MICROPHONE_EnableCallback)(void *cls,
-                                                 GNUNET_MICROPHONE_RecordedDataCallback rdc,
-                                                 void *rdc_cls);
+typedef int (*GNUNET_MICROPHONE_EnableCallback)(void *cls,
+                                                GNUNET_MICROPHONE_RecordedDataCallback rdc,
+                                                void *rdc_cls);
 
 /**
  * Function that disables a microphone.