diff --git a/canbusload.c b/canbusload.c
index b002b66..ff07b60 100644
--- a/canbusload.c
+++ b/canbusload.c
@@ -300,7 +300,7 @@ int main(int argc, char **argv)
 		ptr = argv[optind+i];
 
 		nbytes = strlen(ptr);
-		if (nbytes >= IFNAMSIZ+sizeof("@1000000")+1) {
+		if (nbytes >= (int)(IFNAMSIZ+sizeof("@1000000")+1)) {
 			printf("name of CAN device '%s' is too long!\n", ptr);
 			return 1;
 		}
@@ -324,7 +324,7 @@ int main(int argc, char **argv)
 
 		nbytes = nptr - ptr;  /* interface name is up the first '@' */
 
-		if (nbytes >= IFNAMSIZ) {
+		if (nbytes >= (int)IFNAMSIZ) {
 			printf("name of CAN device '%s' is too long!\n", ptr);
 			return 1;
 		}
@@ -396,7 +396,7 @@ int main(int argc, char **argv)
 					return 1;
 				}
 
-				if (nbytes < sizeof(struct can_frame)) {
+				if (nbytes < (int)sizeof(struct can_frame)) {
 					fprintf(stderr, "read: incomplete CAN frame\n");
 					return 1;
 				}
diff --git a/candump.c b/candump.c
index 0ebe09b..846c706 100644
--- a/candump.c
+++ b/candump.c
@@ -201,7 +201,7 @@ int idx2dindex(int ifidx, int socket) {
 	if (ioctl(socket, SIOCGIFNAME, &ifr) < 0)
 		perror("SIOCGIFNAME");
 
-	if (max_devname_len < strlen(ifr.ifr_name))
+	if (max_devname_len < (int)strlen(ifr.ifr_name))
 		max_devname_len = strlen(ifr.ifr_name);
 
 	strcpy(devname[i], ifr.ifr_name);
diff --git a/cangw.c b/cangw.c
index af4d862..981f1dc 100644
--- a/cangw.c
+++ b/cangw.c
@@ -88,7 +88,7 @@ int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
 	int len = RTA_LENGTH(alen);
 	struct rtattr *rta;
 
-	if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
+	if ((int)(NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len)) > maxlen) {
 		fprintf(stderr, "addattr_l: message exceeded bound of %d\n",
 			maxlen);
 		return -1;
diff --git a/canlogserver.c b/canlogserver.c
index 8319684..0f7f255 100644
--- a/canlogserver.c
+++ b/canlogserver.c
@@ -140,7 +140,7 @@ int idx2dindex(int ifidx, int socket)
 	if (ioctl(socket, SIOCGIFNAME, &ifr) < 0)
 		perror("SIOCGIFNAME");
 
-	if (max_devname_len < strlen(ifr.ifr_name))
+	if (max_devname_len < (int)strlen(ifr.ifr_name))
 		max_devname_len = strlen(ifr.ifr_name);
 
 	strcpy(devname[i], ifr.ifr_name);
diff --git a/canplayer.c b/canplayer.c
index 69b9d3f..1482dc8 100644
--- a/canplayer.c
+++ b/canplayer.c
@@ -359,7 +359,7 @@ int main(int argc, char **argv)
 				return 1;
 			}
 			strcpy(buf, argv[optind+i]);
-			for (j=0; j<BUFSZ; j++) { /* find '=' in assignment */
+			for (j=0; j<(int)BUFSZ; j++) { /* find '=' in assignment */
 				if (buf[j] == '=')
 					break;
 			}
@@ -495,7 +495,7 @@ int main(int argc, char **argv)
 					/* test for logfile timestamps jumping backwards OR      */
 					/* if the user likes to skip long gaps in the timestamps */
 					if ((last_log_tv.tv_sec > log_tv.tv_sec) ||
-					    (skipgap && labs(last_log_tv.tv_sec - log_tv.tv_sec) > skipgap))
+					    (skipgap && labs(last_log_tv.tv_sec - log_tv.tv_sec) > (long)skipgap))
 						create_diff_tv(&today_tv, &diff_tv, &log_tv);
 
 					last_log_tv = log_tv;
diff --git a/cansend.c b/cansend.c
index b19332d..76aacfc 100644
--- a/cansend.c
+++ b/cansend.c
@@ -121,7 +121,7 @@ int main(int argc, char **argv)
 	addr.can_family = AF_CAN;
 	addr.can_ifindex = ifr.ifr_ifindex;
 
-	if (required_mtu > CAN_MTU) {
+	if (required_mtu > (int)CAN_MTU) {
 
 		/* check if the frame fits into the CAN netdevice */
 		if (ioctl(s, SIOCGIFMTU, &ifr) < 0) {
diff --git a/cansniffer.c b/cansniffer.c
index b42298a..90d8d75 100644
--- a/cansniffer.c
+++ b/cansniffer.c
@@ -405,7 +405,7 @@ int handle_keyb(void)
 	unsigned int mask;
 	unsigned int value;
 
-	if (read(0, cmd, 24) > strlen("+1234567812345678\n"))
+	if (read(0, cmd, 24) > (long)strlen("+1234567812345678\n"))
 		return 1; /* ignore */
 
 	if (strlen(cmd) > 0)
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 0a4d733..8e8b8e7 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -96,7 +96,7 @@ struct nlmsghdr {
 				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
 			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
-			   (nlh)->nlmsg_len <= (len))
+			   (int)((nlh)->nlmsg_len) <= (len))
 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
 
 #define NLMSG_NOOP		0x1	/* Nothing.		*/
diff --git a/isotpperf.c b/isotpperf.c
index f65bb85..fe74802 100644
--- a/isotpperf.c
+++ b/isotpperf.c
@@ -365,7 +365,7 @@ int main(int argc, char **argv)
 					percent = 100;
 
 				for (i=0; i < NUMBAR; i++){
-					if (i < percent/PERCENTRES)
+					if (i < (int)(percent/PERCENTRES))
 						printf("X");
 					else
 						printf(".");
diff --git a/lib.c b/lib.c
index 7433933..097b2e8 100644
--- a/lib.c
+++ b/lib.c
@@ -583,7 +583,7 @@ void snprintf_can_error_frame(char *buf, size_t len, const struct canfd_frame *c
 	if (!sep)
 		sep = defsep;
 
-	for (i = 0; i < ARRAY_SIZE(error_classes); i++) {
+	for (i = 0; i < (int)ARRAY_SIZE(error_classes); i++) {
 		mask = 1 << i;
 		if (class & mask) {
 			if (classes)
diff --git a/log2asc.c b/log2asc.c
index f1cab76..3ce800b 100644
--- a/log2asc.c
+++ b/log2asc.c
@@ -138,7 +138,7 @@ void canfd_asc(struct canfd_frame *cf, int devno, int mtu, FILE *outfile)
 
 	fprintf(outfile, "%2d", dlen);
 
-	for (i = 0; i < dlen; i++) {
+	for (i = 0; i < (int)dlen; i++) {
 		fprintf(outfile, " %02X", cf->data[i]);
 	}