diff --git a/src/pcm/SampleFormat.hxx b/src/pcm/SampleFormat.hxx
index 9d956b7f9..bd82acef6 100644
--- a/src/pcm/SampleFormat.hxx
+++ b/src/pcm/SampleFormat.hxx
@@ -122,7 +122,7 @@ sample_format_size(SampleFormat format)
  * @param format a #SampleFormat enum value
  * @return the string
  */
-gcc_pure gcc_malloc
+gcc_pure
 const char *
 sample_format_to_string(SampleFormat format) noexcept;