diff --git a/305/CO_LSSmaster.c b/305/CO_LSSmaster.c
index 0771f48..2a94b8f 100644
--- a/305/CO_LSSmaster.c
+++ b/305/CO_LSSmaster.c
@@ -811,6 +811,8 @@ static CO_LSSmaster_return_t CO_LSSmaster_FsScanInitiate(
         CO_LSSmaster_scantype_t          scan,
         CO_LSS_fastscan_lss_sub_next     lssSub)
 {
+    (void)timeDifference_us;    /* unused */
+
     LSSmaster->fsLssSub = lssSub;
     LSSmaster->fsIdNumber = 0;
 
@@ -900,6 +902,8 @@ static CO_LSSmaster_return_t CO_LSSmaster_FsVerifyInitiate(
         uint32_t                         idNumberCheck,
         CO_LSS_fastscan_lss_sub_next     lssNext)
 {
+    (void)timeDifference_us;    /* unused */
+
     switch (scan) {
         case CO_LSSmaster_FS_SCAN:
             /* ID obtained by scan */
diff --git a/305/CO_LSSslave.c b/305/CO_LSSslave.c
index 111bb69..0ad1264 100644
--- a/305/CO_LSSslave.c
+++ b/305/CO_LSSslave.c
@@ -38,6 +38,8 @@ static void CO_LSSslave_serviceSwitchStateGlobal(
     CO_LSS_cs_t service,
     void *msg)
 {
+    (void)service;  /* unused */
+
     uint8_t *data = CO_CANrxMsg_readData(msg);
     uint8_t mode = data[1];
 
@@ -224,6 +226,8 @@ static void CO_LSSslave_serviceInquire(
     CO_LSS_cs_t service,
     void *msg)
 {
+    (void)msg;  /* unused */
+
     uint32_t value;
 
     if(LSSslave->lssState != CO_LSS_STATE_CONFIGURATION) {
@@ -485,6 +489,8 @@ void CO_LSSslave_process(
         uint16_t               *pendingBitRate,
         uint8_t                *pendingNodeId)
 {
+    (void)activeBitRate;    /* unused */
+
     LSSslave->activeNodeID = activeNodeId;
     *pendingBitRate = LSSslave->pendingBitRate;
     *pendingNodeId = LSSslave->pendingNodeID;
diff --git a/socketCAN/CO_driver.c b/socketCAN/CO_driver.c
index 818a595..662f628 100644
--- a/socketCAN/CO_driver.c
+++ b/socketCAN/CO_driver.c
@@ -131,7 +131,7 @@ static CO_ReturnError_t disableRx(CO_CANmodule_t *CANmodule)
 static CO_ReturnError_t setRxFilters(CO_CANmodule_t *CANmodule)
 {
     int ret;
-    int i;
+    size_t i;
     int count;
     CO_ReturnError_t retval;