diff --git a/src/dump/main.c b/src/dump/main.c
index 18cf389..2967db0 100644
--- a/src/dump/main.c
+++ b/src/dump/main.c
@@ -185,8 +185,11 @@ static int _dump_sink(const char *sink_name, unsigned sink_timeout, const char *
 			const long double now = get_now_monotonic();
 			const long long now_second = floor_ms(now);
 
-			LOG_VERBOSE("Frame: size=%zu, resolution=%ux%u, format=%u, stride=%u, online=%d",
-				frame->used, frame->width, frame->height, frame->format, frame->stride, frame->online);
+			char fourcc_str[8];
+			LOG_VERBOSE("Frame: size=%zu, resolution=%ux%u, fourcc=%s, stride=%u, online=%d",
+				frame->used, frame->width, frame->height,
+				fourcc_to_string(frame->format, fourcc_str, 8),
+				frame->stride, frame->online);
 
 			LOG_DEBUG("       grab_ts=%.3Lf, encode_begin_ts=%.3Lf, encode_end_ts=%.3Lf, latency=%.3Lf",
 				frame->grab_ts, frame->encode_begin_ts, frame->encode_end_ts, now - frame->grab_ts);
diff --git a/src/ustreamer/device.c b/src/ustreamer/device.c
index c3394aa..dca6e9d 100644
--- a/src/ustreamer/device.c
+++ b/src/ustreamer/device.c
@@ -501,18 +501,17 @@ static int _device_open_format(device_s *dev, bool first) {
 
 	// Check format
 	if (fmt.fmt.pix.pixelformat != dev->format) {
-		char format_obtained_str[8];
-		char *format_str_nullable;
-
 		LOG_ERROR("Could not obtain the requested pixelformat=%s; driver gave us %s",
 			_format_to_string_supported(dev->format),
 			_format_to_string_supported(fmt.fmt.pix.pixelformat));
 
-		if ((format_str_nullable = (char *)_format_to_string_nullable(fmt.fmt.pix.pixelformat)) != NULL) {
-			LOG_INFO("Falling back to pixelformat=%s", format_str_nullable);
+		char *format_str;
+		if ((format_str = (char *)_format_to_string_nullable(fmt.fmt.pix.pixelformat)) != NULL) {
+			LOG_INFO("Falling back to pixelformat=%s", format_str);
 		} else {
+			char fourcc_str[8];
 			LOG_ERROR("Unsupported pixelformat=%s (fourcc)",
-				fourcc_to_string(fmt.fmt.pix.pixelformat, format_obtained_str, 8));
+				fourcc_to_string(fmt.fmt.pix.pixelformat, fourcc_str, 8));
 			return -1;
 		}
 	}