diff --git a/src/dos/cdrom.h b/src/dos/cdrom.h
index 75df0654..60c25caa 100644
--- a/src/dos/cdrom.h
+++ b/src/dos/cdrom.h
@@ -47,7 +47,13 @@
 #define REDBOOK_PCM_BYTES_PER_MS     176.4f // 44.1 frames/ms * 4 bytes/frame
 #define BYTES_PER_REDBOOK_PCM_FRAME       4 // 2 bytes/sample * 2 samples/frame
 
-enum { CDROM_USE_SDL, CDROM_USE_ASPI, CDROM_USE_IOCTL_DIO, CDROM_USE_IOCTL_DX, CDROM_USE_IOCTL_MCI };
+enum {
+	CDROM_USE_SDL,
+	CDROM_USE_ASPI,
+	CDROM_USE_IOCTL_DIO,
+	CDROM_USE_IOCTL_DX,
+	CDROM_USE_IOCTL_MCI
+};
 
 typedef struct SMSF {
 	unsigned char min;