diff --git a/tests/testdata/expected/main-samples/obsidian-wikilinks.md b/tests/testdata/expected/main-samples/obsidian-wikilinks.md
index a27bd59..f0acd34 100644
--- a/tests/testdata/expected/main-samples/obsidian-wikilinks.md
+++ b/tests/testdata/expected/main-samples/obsidian-wikilinks.md
@@ -8,6 +8,8 @@ Link to [pure markdown examples](pure-markdown-examples.md#heading-1).
 
 Link to [uppercased-note](Uppercased-note.md).
 
+Link to [\_underscored-note](_underscored-note.md).
+
 Link within backticks: `[[pure-markdown-examples]]`
 
 ````
diff --git a/tests/testdata/input/main-samples/_underscored-note.md b/tests/testdata/input/main-samples/_underscored-note.md
new file mode 100644
index 0000000..8537cd9
--- /dev/null
+++ b/tests/testdata/input/main-samples/_underscored-note.md
@@ -0,0 +1,3 @@
+Older versions of obsidian-export contained a bug where files beginning with an underscore wouldn't get resolved correctly.
+
+This file, and the link to it in `obsidian-wikilinks.md`, serves as a regression test for this issue.
diff --git a/tests/testdata/input/main-samples/obsidian-wikilinks.md b/tests/testdata/input/main-samples/obsidian-wikilinks.md
index 543d9bc..3c98786 100644
--- a/tests/testdata/input/main-samples/obsidian-wikilinks.md
+++ b/tests/testdata/input/main-samples/obsidian-wikilinks.md
@@ -8,6 +8,8 @@ Link to [[pure-markdown-examples#Heading 1|pure markdown examples]].
 
 Link to [[uppercased-note]].
 
+Link to [[_underscored-note]].
+
 Link within backticks: `[[pure-markdown-examples]]`
 
 ```