diff --git a/src/lib.c b/src/lib.c
index 00f234e..cd2751e 100644
--- a/src/lib.c
+++ b/src/lib.c
@@ -53,7 +53,7 @@ static uint16_t offset_words[] = {
 	0x350  /*  C' */
 };
 
-void add_checkwords(RDSGroup *group, uint8_t *bits, uint8_t stream)
+void add_checkwords(RDSGroup *group, uint8_t *bits)
 {
 	uint16_t offset_word;
 
diff --git a/src/lib.h b/src/lib.h
index 603b25a..46b3bce 100644
--- a/src/lib.h
+++ b/src/lib.h
@@ -6,6 +6,6 @@ extern uint16_t crc16_ccitt(char *data, uint16_t len);
 
 uint16_t get_block_grom_group(RDSGroup *group, uint8_t block);
 
-extern void add_checkwords(RDSGroup *group, uint8_t *bits, uint8_t stream);
+extern void add_checkwords(RDSGroup *group, uint8_t *bits);
 extern uint8_t add_rds_af(RDSAFs *af_list, float freq);
 extern char *convert_to_rds_charset(char *str);
\ No newline at end of file
diff --git a/src/rds.c b/src/rds.c
index 8edce6d..2ccdf83 100644
--- a/src/rds.c
+++ b/src/rds.c
@@ -650,7 +650,7 @@ group_coded:
 void get_rds_bits(RDSEncoder* enc, uint8_t *bits, uint8_t stream) {
 	RDSGroup group;
 	get_rds_group(enc, &group, stream);
-	add_checkwords(&group);
+	add_checkwords(&group, &bits);
 }
 
 void reset_rds_state(RDSEncoder* enc, uint8_t program) {