diff --git a/src/audio/SDL_audiocvt.c b/src/audio/SDL_audiocvt.c
index 7bee10c76..ee4f1289b 100644
--- a/src/audio/SDL_audiocvt.c
+++ b/src/audio/SDL_audiocvt.c
@@ -1836,7 +1836,7 @@ SDL_BuildAudioCVT(SDL_AudioCVT * cvt,
 #endif
 
     /* Start off with no conversion necessary */
-
+    SDL_memset(cvt, '\0', sizeof (SDL_AudioCVT));
     cvt->src_format = src_fmt;
     cvt->dst_format = dst_fmt;
     cvt->needed = 0;