diff --git a/test/bare.test b/test/bare.test
index ae513d4..1ab6b72 100755
--- a/test/bare.test
+++ b/test/bare.test
@@ -28,6 +28,8 @@ initrd="${tmpdir}/initramfs-$(uname -r)"
 qemu-img create -f qcow2 "$image" 1G
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # o: Create MBR table.
 # n: Add new partition to table.
 # p: Primary partition.
@@ -104,6 +106,8 @@ fi
 
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # Re-read partition table.
 fdisk "$nbd" << EOF
 w
diff --git a/test/luks.test b/test/luks.test
index 1b82838..98f9935 100755
--- a/test/luks.test
+++ b/test/luks.test
@@ -32,6 +32,8 @@ initrd="${tmpdir}/initramfs-$(uname -r)"
 qemu-img create -f qcow2 "$image" 1G
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # o: Create MBR table.
 # n: Add new partition to table.
 # p: Primary partition.
@@ -116,6 +118,8 @@ fi
 
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # Re-read partition table.
 fdisk "$nbd" << EOF
 w
diff --git a/test/lvm.test b/test/lvm.test
index d37b441..9cb407a 100755
--- a/test/lvm.test
+++ b/test/lvm.test
@@ -33,6 +33,8 @@ initrd="${tmpdir}/initramfs-$(uname -r)"
 qemu-img create -f qcow2 "$image" 1G
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # o: Create MBR table.
 # n: Add new partition to table.
 # p: Primary partition.
@@ -116,6 +118,8 @@ fi
 
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # Re-read partition table.
 fdisk "$nbd" << EOF
 w
diff --git a/test/zfs.test b/test/zfs.test
index ffb199c..821d204 100755
--- a/test/zfs.test
+++ b/test/zfs.test
@@ -31,6 +31,8 @@ initrd="${tmpdir}/initramfs-$(uname -r)"
 qemu-img create -f qcow2 "$image" 1G
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # o: Create MBR table.
 # n: Add new partition to table.
 # p: Primary partition.
@@ -122,6 +124,8 @@ fi
 
 qemu-nbd -c "$nbd" "$image"
 
+sleep 1
+
 # Re-read partition table.
 fdisk "$nbd" << EOF
 w