diff --git a/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.c b/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.c
index 8d9bf00639..303282929f 100644
--- a/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.c
+++ b/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.c
@@ -85,7 +85,7 @@ uint8_t get_delta(uint8_t ap, uint8_t config) {
   return ((config==NFAPI_NR_DMRS_TYPE1)?(pdsch_dmrs_1[ap][2]):(pdsch_dmrs_2[ap][2]));
 }
 
-uint16_t get_dmrs_freq_idx(uint8_t n, uint8_t k_prime, uint8_t delta, uint8_t dmrs_type) {
+uint16_t get_dmrs_freq_idx(uint16_t n, uint8_t k_prime, uint8_t delta, uint8_t dmrs_type) {
   uint16_t dmrs_idx = (dmrs_type)? (6*n+k_prime+delta):((n<<2)+(k_prime<<1)+delta);
   return dmrs_idx;
 }
diff --git a/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.h b/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.h
index 02f454b7d0..6f07874ca0 100644
--- a/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.h
+++ b/openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.h
@@ -45,6 +45,6 @@ void get_Wf(int8_t *Wf, uint8_t ap, uint8_t config);
 
 uint8_t get_delta(uint8_t ap, uint8_t config);
 
-uint16_t get_dmrs_freq_idx(uint8_t n, uint8_t k_prime, uint8_t delta, uint8_t dmrs_type);
+uint16_t get_dmrs_freq_idx(uint16_t n, uint8_t k_prime, uint8_t delta, uint8_t dmrs_type);
 
 uint8_t get_l0(uint8_t mapping_type, uint8_t dmrs_typeA_position);