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-rw-r--r--stream/frequencies.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/stream/frequencies.h b/stream/frequencies.h
index 13cf111f44..234a2adb86 100644
--- a/stream/frequencies.h
+++ b/stream/frequencies.h
@@ -5,6 +5,10 @@
*
* Frequencies are given in kHz
*/
+
+#ifndef FREQUENCIES_H
+#define FREQUENCIES_H
+
#define NTSC_AUDIO_CARRIER 4500
#define PAL_AUDIO_CARRIER_I 6000
#define PAL_AUDIO_CARRIER_BGHN 5500
@@ -109,3 +113,5 @@ extern const struct CHANLISTS chanlists[];
extern int chantab;
extern const struct CHANLIST *chanlist;
extern int chancount;
+
+#endif /* FREQUENCIES_H */