diff --git a/src/libespeak-ng/spect.c b/src/libespeak-ng/spect.c
index d3ff999a..e2e520d8 100644
--- a/src/libespeak-ng/spect.c
+++ b/src/libespeak-ng/spect.c
@@ -36,8 +36,6 @@
 #include "spect.h"
 #include "ieee80.h"
 
-extern char voice_name[];
-
 static int frame_width;
 
 static int default_freq[N_PEAKS] =
diff --git a/src/libespeak-ng/synth_mbrola.c b/src/libespeak-ng/synth_mbrola.c
index 29ba6599..98f18266 100644
--- a/src/libespeak-ng/synth_mbrola.c
+++ b/src/libespeak-ng/synth_mbrola.c
@@ -52,8 +52,6 @@ char mbrola_name[20];
 
 #ifdef INCLUDE_MBROLA
 
-extern unsigned char *outbuf;
-
 #if defined(_WIN32) || defined(_WIN64)
 #include <windows.h>
 #endif
diff --git a/src/libespeak-ng/voice.h b/src/libespeak-ng/voice.h
index d33c8ca7..14e7cc00 100644
--- a/src/libespeak-ng/voice.h
+++ b/src/libespeak-ng/voice.h
@@ -77,9 +77,6 @@ typedef struct {
 
 } voice_t;
 
-// percentages shown to user, ix=N_PEAKS means ALL peaks
-extern unsigned short voice_pcnt[N_PEAKS+1][3];
-
 extern espeak_VOICE current_voice_selected;
 
 extern voice_t *voice;