diff --git a/sv-parser-pp/src/preprocess.rs b/sv-parser-pp/src/preprocess.rs
index 344feef..889ee7e 100644
--- a/sv-parser-pp/src/preprocess.rs
+++ b/sv-parser-pp/src/preprocess.rs
@@ -1127,7 +1127,7 @@ mod tests {
     #[test]
     fn ifdef_nested() {
         let (ret, _) = preprocess(
-            testfile_path("test14.sv"),
+            testfile_path("ifdef_nested.sv"),
             &HashMap::new(),
             &[] as &[String],
             false,
@@ -1136,7 +1136,7 @@ mod tests {
         .unwrap();
         assert_eq!(
             ret.text(),
-            testfile_contents("expected/ifdef_nested")
+            testfile_contents("expected/ifdef_nested.sv")
         );
     }
 
diff --git a/sv-parser-pp/testcases/expected/ifdef_nested b/sv-parser-pp/testcases/expected/ifdef_nested.sv
similarity index 100%
rename from sv-parser-pp/testcases/expected/ifdef_nested
rename to sv-parser-pp/testcases/expected/ifdef_nested.sv
diff --git a/sv-parser-pp/testcases/test14.sv b/sv-parser-pp/testcases/ifdef_nested.sv
similarity index 100%
rename from sv-parser-pp/testcases/test14.sv
rename to sv-parser-pp/testcases/ifdef_nested.sv