diff --git a/src/helper/ioutil.c b/src/helper/ioutil.c
index 6be3e6cd5ac795142675aa622be70234e6bc6486..77e5e35682065cefe6c9ca2027ca463968a42b6d 100644
--- a/src/helper/ioutil.c
+++ b/src/helper/ioutil.c
@@ -225,7 +225,7 @@ int handle_append_command(struct command_context_s *cmd_ctx, char *cmd,
 
 		for (i = 1; i < argc; i++)
 		{
-			if (fwrite(args[i], strlen(args[i]), 1, config_file)!=strlen(args[i]))
+			if (fwrite(args[i], 1, strlen(args[i]), config_file)!=strlen(args[i]))
 				break;
 			if (i != argc - 1)
 			{
diff --git a/src/target/target.c b/src/target/target.c
index b7a4f3f80b60e231ae4e5cfbaf3799ea4b8be02b..6b8f3a0cad0dffc8e4b46e0b31fc23173bee4ab0 100644
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -2623,7 +2623,7 @@ static int handle_virt2phys_command(command_context_t *cmd_ctx,
 
 static void writeData(FILE *f, const void *data, size_t len)
 {
-	size_t written = fwrite(data, len, 1, f);
+	size_t written = fwrite(data, 1, len, f);
 	if (written != len)
 		LOG_ERROR("failed to write %zu bytes: %s", len, strerror(errno));
 }