diff --git a/src/ascii_cmd.c b/src/ascii_cmd.c
index b69a837..e93bb7c 100644
--- a/src/ascii_cmd.c
+++ b/src/ascii_cmd.c
@@ -68,7 +68,7 @@ static void handle_rt1(char *arg, RDSModulator* mod, char* output) {
 }
 
 static void handle_dps1(char *arg, RDSModulator* mod, char* output) {
-    arg[RT_LENGTH * 2] = 0;
+    arg[DPS_LENGTH * 2] = 0;
     set_rds_dps1(mod->enc, xlat(arg));
     strcpy(output, "+\0");
 }
diff --git a/src/rds.h b/src/rds.h
index c398ca0..81a037c 100644
--- a/src/rds.h
+++ b/src/rds.h
@@ -18,7 +18,7 @@
 
 #define RT_LENGTH	64
 #define PS_LENGTH	8
-#define DPS_LENGTH	8
+#define DPS_LENGTH	255
 #define PTYN_LENGTH	8
 #define LPS_LENGTH	32
 #define DEFAULT_GRPSQC "002222XY"