diff --git a/src/core/levels.c b/src/core/levels.c
index 1c526b1a..d6f3f1ef 100644
--- a/src/core/levels.c
+++ b/src/core/levels.c
@@ -66,7 +66,7 @@ int level_get(const char *level)
 	match = 0;
 	for (n = 0; levels[n] != NULL; n++) {
 		if (strncmp(levels[n], level, len) == 0) {
-			if (strlen(levels[n]) == len) {
+			if ((int)strlen(levels[n]) == len) {
 				/* full match */
 				return 1L << n;
 			}
diff --git a/src/fe-common/core/chat-completion.c b/src/fe-common/core/chat-completion.c
index dff1f90b..b04d2dfb 100644
--- a/src/fe-common/core/chat-completion.c
+++ b/src/fe-common/core/chat-completion.c
@@ -130,7 +130,7 @@ static int nick_completion_timeout(void)
 		last_msgs_remove_old(&channel->lastmsgs, keep_msgs_time, now);
 
 		if (keep_msgs_count == 0 ||
-		    g_slist_length(channel->lastownmsgs) > keep_msgs_count) {
+		    (int)g_slist_length(channel->lastownmsgs) > keep_msgs_count) {
 			last_msgs_remove_old(&channel->lastownmsgs,
 					     keep_ownmsgs_time, now);
 		}
diff --git a/src/fe-common/core/completion.c b/src/fe-common/core/completion.c
index 1e4e49db..a61d63b7 100644
--- a/src/fe-common/core/completion.c
+++ b/src/fe-common/core/completion.c
@@ -361,7 +361,7 @@ static GList *completion_get_subcommands(const char *cmd)
 	for (tmp = commands; tmp != NULL; tmp = tmp->next) {
 		COMMAND_REC *rec = tmp->data;
 
-		if (strlen(rec->cmd) < len)
+		if ((int)strlen(rec->cmd) < len)
 			continue;
 
 		if (strchr(rec->cmd+len, ' ') != NULL)
diff --git a/src/fe-common/core/formats.c b/src/fe-common/core/formats.c
index e6cedd1b..205ffec1 100644
--- a/src/fe-common/core/formats.c
+++ b/src/fe-common/core/formats.c
@@ -87,7 +87,7 @@ int format_expand_styles(GString *out, char format, TEXT_DEST_REC *dest)
 		if (p != NULL) {
 			g_string_append_c(out, 4);
 			g_string_append_c(out, FORMAT_COLOR_NOCHANGE);
-			g_string_append_c(out, (int) (p-backs)+'0');
+			g_string_append_c(out, (char) ((int) (p-backs)+'0'));
 			break;
 		}
 
@@ -96,7 +96,7 @@ int format_expand_styles(GString *out, char format, TEXT_DEST_REC *dest)
 		p = strchr(fores, format);
 		if (p != NULL) {
 			g_string_append_c(out, 4);
-			g_string_append_c(out, (int) (p-fores)+'0');
+			g_string_append_c(out, (char) ((int) (p-fores)+'0'));
 			g_string_append_c(out, FORMAT_COLOR_NOCHANGE);
 			break;
 		}
@@ -106,7 +106,7 @@ int format_expand_styles(GString *out, char format, TEXT_DEST_REC *dest)
 		p = strchr(boldfores, format);
 		if (p != NULL) {
 			g_string_append_c(out, 4);
-			g_string_append_c(out, 8+(int) (p-boldfores)+'0');
+			g_string_append_c(out, (char) (8+(int) (p-boldfores)+'0'));
 			g_string_append_c(out, FORMAT_COLOR_NOCHANGE);
 			break;
 		}
diff --git a/src/irc/dcc/dcc-chat.c b/src/irc/dcc/dcc-chat.c
index 59b4a776..7a331388 100644
--- a/src/irc/dcc/dcc-chat.c
+++ b/src/irc/dcc/dcc-chat.c
@@ -64,7 +64,7 @@ static void cmd_msg(const char *data)
 	char *text, *target;
 	void *free_arg;
 
-	g_return_if_fail(text != NULL);
+	g_return_if_fail(data != NULL);
 
 	if (*data != '=') {
 		/* handle only DCC messages */