diff --git a/tests/files/issue-175.png b/tests/files/issue-175.png
new file mode 100644
index 00000000..10d48000
Binary files /dev/null and b/tests/files/issue-175.png differ
diff --git a/tests/regression.rs b/tests/regression.rs
index a8dbe045..91c73cc7 100644
--- a/tests/regression.rs
+++ b/tests/regression.rs
@@ -610,3 +610,15 @@ fn issue_167() {
         BitDepth::Eight,
     );
 }
+
+#[test]
+fn issue_175() {
+    test_it_converts(
+        "tests/files/issue-175.png",
+        None,
+        ColorType::Grayscale,
+        BitDepth::One,
+        ColorType::Grayscale,
+        BitDepth::One,
+    );
+}