diff --git a/src/rds.c b/src/rds.c
index 20f9985..185c2ba 100644
--- a/src/rds.c
+++ b/src/rds.c
@@ -621,10 +621,10 @@ void set_rds_grpseq(unsigned char* grpseq) {
 		rds_data.grp_sqc[len++] = *grpseq++;
 }
 
-void set_rds_udg1(uint16_t** groups) {
+void set_rds_udg1(uint16_t (*groups)[3]) {
 	memcpy(&rds_data.udg1, &groups, sizeof(groups));
 }
 
-void set_rds_udg2(uint16_t** groups) {
+void set_rds_udg1(uint16_t (*groups)[3]) {
 	memcpy(&rds_data.udg2, &groups, sizeof(groups));
 }
\ No newline at end of file
diff --git a/src/rds.h b/src/rds.h
index a0faa7b..3ec586a 100644
--- a/src/rds.h
+++ b/src/rds.h
@@ -260,7 +260,7 @@ extern void set_rds_di(uint8_t di);
 extern float get_rds_sample();
 extern void set_rds_cg(uint16_t* blocks);
 extern void set_rds_grpseq(unsigned char* grpseq);
-extern void set_rds_udg1(uint16_t** groups);
-extern void set_rds_udg2(uint16_t** groups);
+extern void set_rds_udg1(uint16_t (*groups)[3]);
+extern void set_rds_udg2(uint16_t (*groups)[3]);
 
 #endif /* RDS_H */