diff --git a/drivers/include/jc42.h b/drivers/include/jc42.h
index 4eedbf393d..3300be05c9 100644
--- a/drivers/include/jc42.h
+++ b/drivers/include/jc42.h
@@ -81,7 +81,7 @@ extern const saul_driver_t jc42_temperature_saul_driver;
  * @return                   0 on success
  * @return                  -1 on error
  */
-int jc42_init(jc42_t* dev, jc42_params_t* params);
+int jc42_init(jc42_t* dev, const jc42_params_t* params);
 
 /**
  * @brief   Get content of configuration register
diff --git a/drivers/jc42/jc42.c b/drivers/jc42/jc42.c
index f08a1ae0c6..6b757646a1 100644
--- a/drivers/jc42/jc42.c
+++ b/drivers/jc42/jc42.c
@@ -78,7 +78,7 @@ int jc42_get_temperature(const jc42_t* dev, int16_t* temperature)
     return JC42_OK;
 }
 
-int jc42_init(jc42_t* dev, jc42_params_t* params)
+int jc42_init(jc42_t* dev, const jc42_params_t* params)
 {
     uint16_t config;
     dev->i2c = params->i2c;
diff --git a/sys/auto_init/saul/auto_init_jc42.c b/sys/auto_init/saul/auto_init_jc42.c
index 42cd51482d..87f5992926 100644
--- a/sys/auto_init/saul/auto_init_jc42.c
+++ b/sys/auto_init/saul/auto_init_jc42.c
@@ -50,11 +50,9 @@ extern const saul_driver_t jc42_temperature_saul_driver;
 void auto_init_jc42(void)
 {
     for (unsigned i = 0; i < JC42_NUMOF; i++) {
-        const jc42_params_t *p = &jc42_params[i];
-
         LOG_DEBUG("[auto_init_saul] initializing jc42 #%u\n", i);
 
-        if (jc42_init(&jc42_devs[i], (jc42_params_t*) p) < 0) {
+        if (jc42_init(&jc42_devs[i], &jc42_params[i]) < 0) {
             LOG_ERROR("[auto_init_saul] error initializing jc42 #%u\n", i);
             continue;
         }