diff --git a/convert/main.c b/convert/main.c
index 4f65765d..0deccd9c 100644
--- a/convert/main.c
+++ b/convert/main.c
@@ -88,6 +88,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <getopt.h>
+#include <pthread.h>
 #include <stdbool.h>
 
 #include "ctree.h"
@@ -119,10 +120,12 @@ static void *print_copied_inodes(void *p)
 	task_period_start(priv->info, 1000 /* 1s */);
 	while (1) {
 		count++;
+		pthread_mutex_lock(&priv->mutex);
 		printf("copy inodes [%c] [%10llu/%10llu]\r",
 		       work_indicator[count % 4],
 		       (unsigned long long)priv->cur_copy_inodes,
 		       (unsigned long long)priv->max_copy_inodes);
+		pthread_mutex_unlock(&priv->mutex);
 		fflush(stdout);
 		task_period_wait(priv->info);
 	}
@@ -1287,6 +1290,11 @@ static int do_convert(const char *devname, u32 convert_flags, u32 nodesize,
 	}
 
 	printf("creating btrfs metadata");
+	ret = pthread_mutex_init(&ctx.mutex, NULL);
+	if (ret) {
+		error("failed to initialize mutex: %d", ret);
+		goto fail;
+	}
 	ctx.max_copy_inodes = (cctx.inodes_count - cctx.free_inodes_count);
 	ctx.cur_copy_inodes = 0;
 
diff --git a/convert/source-ext2.c b/convert/source-ext2.c
index c6f9f28e..24744e22 100644
--- a/convert/source-ext2.c
+++ b/convert/source-ext2.c
@@ -18,6 +18,7 @@
 
 #include "kerncompat.h"
 #include <linux/limits.h>
+#include <pthread.h>
 #include "disk-io.h"
 #include "transaction.h"
 #include "utils.h"
@@ -850,7 +851,9 @@ static int ext2_copy_inodes(struct btrfs_convert_context *cctx,
 		ret = ext2_copy_single_inode(trans, root,
 					objectid, ext2_fs, ext2_ino,
 					&ext2_inode, convert_flags);
+		pthread_mutex_lock(&p->mutex);
 		p->cur_copy_inodes++;
+		pthread_mutex_unlock(&p->mutex);
 		if (ret)
 			return ret;
 		if (trans->blocks_used >= 4096) {
diff --git a/convert/source-fs.h b/convert/source-fs.h
index ca32d159..3a6fa46c 100644
--- a/convert/source-fs.h
+++ b/convert/source-fs.h
@@ -18,6 +18,8 @@
 #define __BTRFS_CONVERT_SOURCE_FS_H__
 
 #include "kerncompat.h"
+#include <pthread.h>
+
 
 #define CONV_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
 
@@ -37,6 +39,7 @@ extern const struct simple_range btrfs_reserved_ranges[3];
 struct task_info;
 
 struct task_ctx {
+	pthread_mutex_t mutex;
 	u64 max_copy_inodes;
 	u64 cur_copy_inodes;
 	struct task_info *info;