diff --git a/swh/loader/svn/replay.py b/swh/loader/svn/replay.py
--- a/swh/loader/svn/replay.py
+++ b/swh/loader/svn/replay.py
@@ -304,7 +304,7 @@
                 with open(self.fullpath, "rb") as f:
                     content = f.read()
                 self.svnrepo.export(
-                    os.path.join(self.svnrepo.remote_url.encode(), self.path),
+                    os.path.join(self.svnrepo.remote_url, os.fsdecode(self.path)),
                     to=self.fullpath,
                     peg_rev=self.editor.revnum,
                     ignore_keywords=True,
diff --git a/swh/loader/svn/svn.py b/swh/loader/svn/svn.py
--- a/swh/loader/svn/svn.py
+++ b/swh/loader/svn/svn.py
@@ -42,6 +42,10 @@
 logger = logging.getLogger(__name__)
 
 
+def quote_svn_url(url: str) -> str:
+    return url.replace(" ", "%20")
+
+
 class SvnRepo:
     """Svn repository representation.
 
@@ -272,7 +276,7 @@
     def info(self, origin_url: str):
         """Simple wrapper around subvertpy.client.Client.info enabling to retry
         the command if a network error occurs."""
-        info = self.client.info(origin_url.rstrip("/"))
+        info = self.client.info(quote_svn_url(origin_url).rstrip("/"))
         return next(iter(info.values()))
 
     @svn_retry()
@@ -312,12 +316,12 @@
         logger.debug(
             "svn export %s %s%s %s",
             " ".join(options),
-            url,
+            quote_svn_url(url),
             f"@{peg_rev}" if peg_rev else "",
             to,
         )
         return self.client.export(
-            url,
+            quote_svn_url(url),
             to=to,
             rev=rev,
             peg_rev=peg_rev,
@@ -361,12 +365,12 @@
         logger.debug(
             "svn checkout %s %s%s %s",
             " ".join(options),
-            self.remote_url,
+            quote_svn_url(url),
             f"@{peg_rev}" if peg_rev else "",
             path,
         )
         return self.client.checkout(
-            url,
+            quote_svn_url(url),
             path=path,
             rev=rev,
             peg_rev=peg_rev,
diff --git a/swh/loader/svn/tests/test_loader.py b/swh/loader/svn/tests/test_loader.py
--- a/swh/loader/svn/tests/test_loader.py
+++ b/swh/loader/svn/tests/test_loader.py
@@ -2172,3 +2172,28 @@
     )
 
     check_snapshot(loader.snapshot, loader.storage)
+
+
+def test_loader_with_spaces_in_svn_url(swh_storage, repo_url, tmp_path):
+    filename = "file with spaces.txt"
+    content = b"foo"
+
+    add_commit(
+        repo_url,
+        "Add file with spaces in its name",
+        [
+            CommitChange(
+                change_type=CommitChangeType.AddOrUpdate,
+                path=filename,
+                data=content,
+            ),
+        ],
+    )
+
+    svnrepo = SvnRepo(repo_url, repo_url, tmp_path, max_content_length=10000)
+
+    dest_path = f"{tmp_path}/file"
+    svnrepo.export(f"{repo_url}/{filename}", to=dest_path)
+
+    with open(dest_path, "rb") as f:
+        assert f.read() == content