diff --git a/src/libespeak-ng/speech.c b/src/libespeak-ng/speech.c
index 1815375f..9ac8f0c3 100644
--- a/src/libespeak-ng/speech.c
+++ b/src/libespeak-ng/speech.c
@@ -58,6 +58,7 @@
 #include "event.h"
 
 unsigned char *outbuf = NULL;
+int outbuf_size = 0;
 
 espeak_EVENT *event_list = NULL;
 int event_list_ix = 0;
diff --git a/src/libespeak-ng/synthesize.h b/src/libespeak-ng/synthesize.h
index a83784c4..a2c52ea0 100644
--- a/src/libespeak-ng/synthesize.h
+++ b/src/libespeak-ng/synthesize.h
@@ -512,7 +512,6 @@ extern int formant_rate[];         // max rate of change of each formant
 extern SPEED_FACTORS speed;
 
 extern long count_samples;
-extern int outbuf_size;
 extern unsigned char *out_ptr;
 extern unsigned char *out_start;
 extern unsigned char *out_end;
diff --git a/src/libespeak-ng/wavegen.c b/src/libespeak-ng/wavegen.c
index ee355625..dd656f9c 100644
--- a/src/libespeak-ng/wavegen.c
+++ b/src/libespeak-ng/wavegen.c
@@ -107,7 +107,6 @@ static double two_pi_t;
 unsigned char *out_ptr;
 unsigned char *out_start;
 unsigned char *out_end;
-int outbuf_size = 0;
 
 // the queue of operations passed to wavegen from sythesize
 intptr_t wcmdq[N_WCMDQ][4];