diff --git a/vhook/ppm.c b/vhook/ppm.c
index 0e37ac412e..94c034aa83 100644
--- a/vhook/ppm.c
+++ b/vhook/ppm.c
@@ -232,8 +232,8 @@ void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width,
     AVPicture picture1;
     AVPicture picture2;
     AVPicture *pict = picture;
-    int out_width;
-    int out_height;
+    int av_uninit(out_width);
+    int av_uninit(out_height);
     int i;
     uint8_t *ptr = NULL;
     FILE *in = rwpipe_reader( ci->rw );