diff --git a/app/src/decoder.h b/app/src/decoder.h
index 4d4f9191..88c0a8cb 100644
--- a/app/src/decoder.h
+++ b/app/src/decoder.h
@@ -5,8 +5,6 @@
 #include <SDL2/SDL_net.h>
 
 struct frames;
-typedef struct SDL_Thread SDL_Thread;
-typedef struct SDL_mutex SDL_mutex;
 
 struct decoder {
     struct frames *frames;
diff --git a/app/src/frames.h b/app/src/frames.h
index 1d73af53..81c6eabf 100644
--- a/app/src/frames.h
+++ b/app/src/frames.h
@@ -5,8 +5,6 @@
 
 // forward declarations
 typedef struct AVFrame AVFrame;
-typedef struct SDL_mutex SDL_mutex;
-typedef struct SDL_cond SDL_cond;
 
 struct frames {
     AVFrame *decoding_frame;