diff --git a/meta/lib/oeqa/selftest/cases/wic.py b/meta/lib/oeqa/selftest/cases/wic.py
index 59fd99a788..d98af8713a 100644
--- a/meta/lib/oeqa/selftest/cases/wic.py
+++ b/meta/lib/oeqa/selftest/cases/wic.py
@@ -535,6 +535,39 @@ part /mnt --source rootfs --ondisk mmcblk0 --fstype=ext4 --exclude-path bin/whoa
         finally:
             os.environ['PATH'] = oldpath
 
+    def test_exclude_path_with_extra_space(self):
+        """Test having --exclude-path with IMAGE_ROOTFS_EXTRA_SPACE. [Yocto #15555]"""
+
+        with NamedTemporaryFile("w", suffix=".wks") as wks:
+            wks.writelines(
+                ['bootloader --ptable gpt\n',
+                 'part /boot --size=100M --active --fstype=ext4 --label boot\n',
+                 'part /     --source rootfs      --fstype=ext4 --label root --exclude-path boot/\n'])
+            wks.flush()
+            config = 'IMAGE_ROOTFS_EXTRA_SPACE = "500000"\n'\
+                     'DEPENDS:pn-core-image-minimal += "wic-tools"\n'\
+                     'IMAGE_FSTYPES += "wic"\n'\
+                     'WKS_FILE = "%s"\n' % wks.name
+            self.append_config(config)
+            bitbake('core-image-minimal')
+
+        """
+        the output of "wic ls <image>.wic" will look something like:
+            Num     Start        End          Size      Fstype
+             1         17408    136332287    136314880  ext4
+             2     136332288    171464703     35132416  ext4
+        we are looking for the size of partition 2
+        i.e. in this case the number 35,132,416
+        without the fix the size will be around 85,403,648
+        with the fix the size should be around 799,960,064
+        """
+        bb_vars = get_bb_vars(['DEPLOY_DIR_IMAGE', 'MACHINE'], 'core-image-minimal')
+        deploy_dir = bb_vars['DEPLOY_DIR_IMAGE']
+        machine = bb_vars['MACHINE']
+        wicout = glob(os.path.join(deploy_dir, "core-image-minimal-%s.rootfs-*.wic" % machine))[0]
+        size_of_root_partition = int(runCmd("wic ls %s" % wicout).output.split('\n')[2].split()[3])
+        self.assertGreater(size_of_root_partition, 500000000)
+
     def test_include_path(self):
         """Test --include-path wks option."""
 
diff --git a/scripts/lib/wic/partition.py b/scripts/lib/wic/partition.py
index bf2c34d594..b18431d8fb 100644
--- a/scripts/lib/wic/partition.py
+++ b/scripts/lib/wic/partition.py
@@ -244,7 +244,7 @@ class Partition():
             # from bitbake variable
             rsize_bb = get_bitbake_var('ROOTFS_SIZE')
             rdir = get_bitbake_var('IMAGE_ROOTFS')
-            if rsize_bb and rdir == rootfs_dir:
+            if rsize_bb and (rdir == rootfs_dir or (rootfs_dir.split('/')[-2] == "tmp-wic" and rootfs_dir.split('/')[-1][:6] == "rootfs")):
                 # Bitbake variable ROOTFS_SIZE is calculated in
                 # Image._get_rootfs_size method from meta/lib/oe/image.py
                 # using IMAGE_ROOTFS_SIZE, IMAGE_ROOTFS_ALIGNMENT,