Fix some warnings.

4 files changed, 4 insertions, 4 deletions

diff --git a/src/lib/audio_filter.h b/src/lib/audio_filter.h
index 0d9bcbacd..9fc69daad 100644
--- a/src/lib/audio_filter.h
+++ b/src/lib/audio_filter.h
@@ -22,7 +22,7 @@
 
 class AudioBuffers;
 class audio_filter_impulse_kernel_test;
-class audio_filter_impulse_input_test;
+struct audio_filter_impulse_input_test;
 
 class AudioFilter
 {
diff --git a/src/lib/ffmpeg_audio_stream.h b/src/lib/ffmpeg_audio_stream.h
index 3c85abd93..8a9525422 100644
--- a/src/lib/ffmpeg_audio_stream.h
+++ b/src/lib/ffmpeg_audio_stream.h
@@ -21,7 +21,7 @@
 #include "audio_mapping.h"
 #include "dcpomatic_time.h"
 
-class ffmpeg_pts_offset_test;
+struct ffmpeg_pts_offset_test;
 
 class FFmpegAudioStream : public FFmpegStream
 {
diff --git a/src/lib/ffmpeg_content.h b/src/lib/ffmpeg_content.h
index 13c33201e..da8152c0d 100644
--- a/src/lib/ffmpeg_content.h
+++ b/src/lib/ffmpeg_content.h
@@ -33,7 +33,7 @@ struct AVStream;
 class Filter;
 class FFmpegSubtitleStream;
 class FFmpegAudioStream;
-class ffmpeg_pts_offset_test;
+struct ffmpeg_pts_offset_test;
 
 class FFmpegContentProperty : public VideoContentProperty
 {
diff --git a/src/lib/film.h b/src/lib/film.h
index 4e949d863..8a0823094 100644
--- a/src/lib/film.h
+++ b/src/lib/film.h
@@ -47,7 +47,7 @@ class Playlist;
 class AudioContent;
 class Scaler;
 class Screen;
-class isdcf_name_test;
+struct isdcf_name_test;
 
 /** @class Film
  *