diff --git a/test/testautomation_audio.c b/test/testautomation_audio.c
index a87a867a86..1f06e70f94 100644
--- a/test/testautomation_audio.c
+++ b/test/testautomation_audio.c
@@ -501,13 +501,13 @@ static int audio_printCurrentAudioDriver(void *arg)
 }
 
 /* Definition of all formats, channels, and frequencies used to test audio conversions */
-static const int g_numAudioFormats = 14;
 static SDL_AudioFormat g_audioFormats[] = { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S16SYS, AUDIO_S16,
                                     AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S32SYS, AUDIO_S32,
                                     AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_F32SYS, AUDIO_F32 };
 static const char *g_audioFormatsVerbose[] = { "AUDIO_S8", "AUDIO_U8", "AUDIO_S16LSB", "AUDIO_S16MSB", "AUDIO_S16SYS", "AUDIO_S16",
                                        "AUDIO_S32LSB", "AUDIO_S32MSB", "AUDIO_S32SYS", "AUDIO_S32",
                                        "AUDIO_F32LSB", "AUDIO_F32MSB", "AUDIO_F32SYS", "AUDIO_F32" };
+static const int g_numAudioFormats = SDL_arraysize(g_audioFormats);
 static const int g_numAudioChannels = 4;
 static Uint8 g_audioChannels[] = { 1, 2, 4, 6 };
 static const int g_numAudioFrequencies = 4;