diff --git a/components/bt/controller/esp32c2/bt.c b/components/bt/controller/esp32c2/bt.c
index 1daade25f86..2b71956a661 100644
--- a/components/bt/controller/esp32c2/bt.c
+++ b/components/bt/controller/esp32c2/bt.c
@@ -1459,12 +1459,13 @@ static const char *TAG_SM_ALG = "ble_sm_alg";
 #include "tinycrypt/ecc_dh.h"
 
 
+#if CONFIG_BT_CONTROLLER_ONLY
 /* Used by uECC to get random data */
 static int ecc_rand_func(uint8_t *dst, unsigned int len)
 {
     int offset_cnt = 0;
     uint8_t *u8ptr = dst;
-    uint64_t random_64 = 0;
+    uint64_t random64 = 0;
 
     while(len > 0) {
         random64 = (uint64_t)esp_random();
@@ -1478,6 +1479,7 @@ static int ecc_rand_func(uint8_t *dst, unsigned int len)
     return 1;
 }
 
+#endif // CONFIG_BT_CONTROLLER_ONLY
 #endif // CONFIG_BT_LE_SM_SC
 #endif // CONFIG_BT_LE_CRYPTO_STACK_MBEDTLS
 
diff --git a/components/bt/controller/esp32c6/bt.c b/components/bt/controller/esp32c6/bt.c
index 5eb26edc600..01f27451b65 100644
--- a/components/bt/controller/esp32c6/bt.c
+++ b/components/bt/controller/esp32c6/bt.c
@@ -1669,12 +1669,13 @@ static const char *TAG_SM_ALG = "ble_sm_alg";
 #include "tinycrypt/cmac_mode.h"
 #include "tinycrypt/ecc_dh.h"
 
+#if CONFIG_BT_CONTROLLER_ONLY
 /* Used by uECC to get random data */
 static int ecc_rand_func(uint8_t *dst, unsigned int len)
 {
     int offset_cnt = 0;
     uint8_t *u8ptr = dst;
-    uint64_t random_64 = 0;
+    uint64_t random64 = 0;
 
     while(len > 0) {
         random64 = (uint64_t)esp_random();
@@ -1687,6 +1688,7 @@ static int ecc_rand_func(uint8_t *dst, unsigned int len)
 
     return 1;
 }
+#endif // CONFIG_BT_CONTROLLER_ONLY
 #endif // CONFIG_BT_LE_SM_SC
 #endif // CONFIG_BT_LE_CRYPTO_STACK_MBEDTLS
 
diff --git a/components/bt/controller/esp32h2/bt.c b/components/bt/controller/esp32h2/bt.c
index 3b7c5be0113..44d1ed41236 100644
--- a/components/bt/controller/esp32h2/bt.c
+++ b/components/bt/controller/esp32h2/bt.c
@@ -1619,12 +1619,13 @@ void esp_ble_controller_log_dump_all(bool output)
 #include "tinycrypt/cmac_mode.h"
 #include "tinycrypt/ecc_dh.h"
 
+#if CONFIG_BT_CONTROLLER_ONLY
 /* Used by uECC to get random data */
 static int ecc_rand_func(uint8_t *dst, unsigned int len)
 {
     int offset_cnt = 0;
     uint8_t *u8ptr = dst;
-    uint64_t random_64 = 0;
+    uint64_t random64 = 0;
 
     while(len > 0) {
         random64 = (uint64_t)esp_random();
@@ -1637,6 +1638,7 @@ static int ecc_rand_func(uint8_t *dst, unsigned int len)
 
     return 1;
 }
+#endif // CONFIG_BT_CONTROLLER_ONLY
 #endif // CONFIG_BT_LE_SM_SC
 #endif // CONFIG_BT_LE_CRYPTO_STACK_MBEDTLS