diff --git a/main.h b/main.h
index b261840d..45f635c9 100644
--- a/main.h
+++ b/main.h
@@ -91,11 +91,11 @@ int lower_digit(int number);
 void update_rs(unsigned char parity[32], unsigned char c);
 void write_little_endian(unsigned int word, int num_bytes, FILE *wav_file);
 //static int init_rf();
-int Encode_8b10b[][256];
+extern int Encode_8b10b[][256];
 //const unsigned char ALPHA_TO[];
 // const unsigned char *CCodecAO40::encode(unsigned char *source_bytes, int byte_count);
-const unsigned char *encode(unsigned char *source_bytes, int byte_count);
-void update_rs(unsigned char parity[32], unsigned char c);
+extern const unsigned char *encode(unsigned char *source_bytes, int byte_count);
+extern void update_rs(unsigned char parity[32], unsigned char c);
 void program_radio();
 FILE *sopen(const char *program);
 void write_to_buffer(int i, int symbol, int val);