diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index 6a0d58ee..b0dfcc5f 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -223,7 +223,7 @@ void pcu_l1if_tx_agch(bitvec * block, int plen)
 void pcu_l1if_tx_pch(bitvec * block, int plen, const char *imsi)
 {
 	struct gprs_rlcmac_bts *bts = bts_main_data();
-	uint8_t data[3+1+23]; /* prefix PLEN */
+	uint8_t data[3+23]; /* paging group, prefix PLEN */
 
 	/* paging group */
 	if (!imsi || strlen(imsi) < 3)