diff --git a/components/bt/controller/esp32c2/bt.c b/components/bt/controller/esp32c2/bt.c
index 104503d8e25..41149cd8e51 100644
--- a/components/bt/controller/esp32c2/bt.c
+++ b/components/bt/controller/esp32c2/bt.c
@@ -1466,12 +1466,13 @@ static mbedtls_ecp_keypair keypair;
 #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();
@@ -1485,6 +1486,7 @@ 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 d6c73f4521f..d0e2297c684 100644
--- a/components/bt/controller/esp32c6/bt.c
+++ b/components/bt/controller/esp32c6/bt.c
@@ -1676,12 +1676,13 @@ static mbedtls_ecp_keypair keypair;
 #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();
@@ -1694,6 +1695,7 @@ 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 c51cd40c951..eb0371fe896 100644
--- a/components/bt/controller/esp32h2/bt.c
+++ b/components/bt/controller/esp32h2/bt.c
@@ -1628,12 +1628,13 @@ static mbedtls_ecp_keypair keypair;
 #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();
@@ -1646,6 +1647,7 @@ 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