diff --git a/channels/chan_dahdi.h b/channels/chan_dahdi.h
index c22ed01812..212a0bf380 100644
--- a/channels/chan_dahdi.h
+++ b/channels/chan_dahdi.h
@@ -39,6 +39,7 @@
 #include "asterisk/channel.h"
 #include "asterisk/dsp.h"
 #include "asterisk/app.h"
+#include "asterisk/mwi.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)
 extern "C" {
diff --git a/channels/sig_pri.c b/channels/sig_pri.c
index 3675b0efaa..004f4e854e 100644
--- a/channels/sig_pri.c
+++ b/channels/sig_pri.c
@@ -101,6 +101,7 @@
 #include "asterisk/options.h"
 #include "asterisk/pbx.h"
 #include "asterisk/app.h"
+#include "asterisk/mwi.h"
 #include "asterisk/file.h"
 #include "asterisk/callerid.h"
 #include "asterisk/say.h"