diff --git a/src/cubeb_resampler_internal.h b/src/cubeb_resampler_internal.h
index c63bff344..3e8b097be 100644
--- a/src/cubeb_resampler_internal.h
+++ b/src/cubeb_resampler_internal.h
@@ -269,7 +269,7 @@ class cubeb_resampler_speex_one_way : public processor {
                    resampling_out_buffer.data(), &out_len);
 
     if (out_len < output_frame_count) {
-      LOGV("underrun during resampling: got %u frames, expected %u", out_len, output_frame_count);
+      LOGV("underrun during resampling: got %u frames, expected %zu", (unsigned)out_len, output_frame_count);
       // silence the rightmost part
       T* data = resampling_out_buffer.data();
       for (uint32_t i = frames_to_samples(out_len); i < frames_to_samples(output_frame_count); i++) {