diff --git a/main.h b/main.h
index 318ccd0a..65c9e4b8 100644
--- a/main.h
+++ b/main.h
@@ -62,7 +62,7 @@
 #define CHECK 0
 #define DISABLED 0
 #define CARRIER 1
-#define DTMF-APRS 2
+#define DTMF_APRS 2
 
 uint32_t tx_freq_hz = 434900000 + FREQUENCY_OFFSET;
 uint8_t data[1024];