diff --git a/src/partition/repart.c b/src/partition/repart.c
index be16f5a067..7b6201efa8 100644
--- a/src/partition/repart.c
+++ b/src/partition/repart.c
@@ -3977,6 +3977,40 @@ static int find_root(char **ret, int *ret_fd) {
         return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "Failed to discover root block device.");
 }
 
+static int resize_pt(int fd) {
+        char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
+        _cleanup_(fdisk_unref_contextp) struct fdisk_context *c = NULL;
+        int r;
+
+        /* After resizing the backing file we need to resize the partition table itself too, so that it takes
+         * possession of the enlarged backing file. For this it suffices to open the device with libfdisk and
+         * immediately write it again, with no changes. */
+
+        c = fdisk_new_context();
+        if (!c)
+                return log_oom();
+
+        xsprintf(procfs_path, "/proc/self/fd/%i", fd);
+        r = fdisk_assign_device(c, procfs_path, 0);
+        if (r < 0)
+                return log_error_errno(r, "Failed to open device '%s': %m", procfs_path);
+
+        r = fdisk_has_label(c);
+        if (r < 0)
+                return log_error_errno(r, "Failed to determine whether disk '%s' has a disk label: %m", procfs_path);
+        if (r == 0) {
+                log_debug("Not resizing partition table, as there currently is none.");
+                return 0;
+        }
+
+        r = fdisk_write_disklabel(c);
+        if (r < 0)
+                return log_error_errno(r, "Failed to write resized partition table: %m");
+
+        log_info("Resized partition table.");
+        return 1;
+}
+
 static int resize_backing_fd(const char *node, int *fd) {
         char buf1[FORMAT_BYTES_MAX], buf2[FORMAT_BYTES_MAX];
         _cleanup_close_ int writable_fd = -1;
@@ -4029,6 +4063,10 @@ static int resize_backing_fd(const char *node, int *fd) {
                         /* Fallback to truncation, if fallocate() is not supported. */
                         log_debug("Backing file system does not support fallocate(), falling back to ftruncate().");
                 } else {
+                        r = resize_pt(writable_fd);
+                        if (r < 0)
+                                return r;
+
                         if (st.st_size == 0) /* Likely regular file just created by us */
                                 log_info("Allocated %s for '%s'.", buf2, node);
                         else
@@ -4042,6 +4080,10 @@ static int resize_backing_fd(const char *node, int *fd) {
                 return log_error_errno(errno, "Failed to grow '%s' from %s to %s by truncation: %m",
                                        node, buf1, buf2);
 
+        r = resize_pt(writable_fd);
+        if (r < 0)
+                return r;
+
         if (st.st_size == 0) /* Likely regular file just created by us */
                 log_info("Sized '%s' to %s.", node, buf2);
         else