diff --git a/src/examples/audio-src.c b/src/examples/audio-src.c
index f6120b345..22b6a581a 100644
--- a/src/examples/audio-src.c
+++ b/src/examples/audio-src.c
@@ -73,7 +73,9 @@ static void on_process(void *userdata)
 		return;
 
 	stride = sizeof(float) * DEFAULT_CHANNELS;
-	n_frames = SPA_MIN(b->requested, buf->datas[0].maxsize / stride);
+	n_frames = buf->datas[0].maxsize / stride;
+	if (b->requested)
+		n_frames = SPA_MIN((int)b->requested, n_frames);
 
 	fill_f32(data, p, n_frames);
 
diff --git a/src/tools/pw-cat.c b/src/tools/pw-cat.c
index db6d61743..2ed7529fd 100644
--- a/src/tools/pw-cat.c
+++ b/src/tools/pw-cat.c
@@ -845,7 +845,8 @@ static void on_process(void *userdata)
 		bool null_frame = false;
 
 		n_frames = d->maxsize / data->stride;
-		n_frames = SPA_MIN(n_frames, (int)b->requested);
+		if (b->requested)
+			n_frames = SPA_MIN(n_frames, (int)b->requested);
 
 		/* Note that when playing encoded audio, the encoded_playback_fill()
 		 * fill callback actually returns number of bytes, not frames, since