diff --git a/src/libespeak-ng/mbrowrap.c b/src/libespeak-ng/mbrowrap.c
index 185ee3ed..0271bdb4 100644
--- a/src/libespeak-ng/mbrowrap.c
+++ b/src/libespeak-ng/mbrowrap.c
@@ -18,6 +18,8 @@
 
 #include "config.h"
 
+#include <espeak-ng/espeak_ng.h>
+
 #include "speech.h"
 
 #include <stdarg.h>
diff --git a/src/libespeak-ng/wave.c b/src/libespeak-ng/wave.c
index 14b32c7f..dd32ecfe 100644
--- a/src/libespeak-ng/wave.c
+++ b/src/libespeak-ng/wave.c
@@ -19,6 +19,8 @@
 
 #include "config.h"
 
+#include <espeak-ng/espeak_ng.h>
+
 #include "speech.h"
 
 #include <stdbool.h>
diff --git a/src/libespeak-ng/wave_pulse.c b/src/libespeak-ng/wave_pulse.c
index 11a3c542..42211ee4 100644
--- a/src/libespeak-ng/wave_pulse.c
+++ b/src/libespeak-ng/wave_pulse.c
@@ -26,6 +26,8 @@
 //
 #include "config.h"
 
+#include <espeak-ng/espeak_ng.h>
+
 #include "speech.h"
 
 #include <stdbool.h>
diff --git a/src/libespeak-ng/wave_sada.c b/src/libespeak-ng/wave_sada.c
index 5d416407..4a25167c 100644
--- a/src/libespeak-ng/wave_sada.c
+++ b/src/libespeak-ng/wave_sada.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2008, Sun Microsystems, Inc.
- * Copyright (C) 2015 Reece H. Dunn
+ * Copyright (C) 2015-2016 Reece H. Dunn
  * eSpeak driver for Solaris Audio Device Architecture (SADA)
  * Written by Willie Walker, based on the eSpeak PulseAudio driver
  * from Gilles Casse
@@ -19,6 +19,10 @@
  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
  */
 
+#include "config.h"
+
+#include <espeak-ng/espeak_ng.h>
+
 #include "speech.h"
 
 #include <errno.h>
diff --git a/src/speak-ng.c b/src/speak-ng.c
index cd0c4157..41bfeb8f 100644
--- a/src/speak-ng.c
+++ b/src/speak-ng.c
@@ -19,6 +19,8 @@
 
 #include "config.h"
 
+#include <espeak-ng/espeak_ng.h>
+
 #include "speech.h"
 
 #include <stdbool.h>