diff --git a/pkg/reader/clj_conformance_test.go b/pkg/reader/clj_conformance_test.go
index c7ef08c..6a33484 100644
--- a/pkg/reader/clj_conformance_test.go
+++ b/pkg/reader/clj_conformance_test.go
@@ -290,7 +290,7 @@ func getFromCache(program string) (bool, string, error) {
 	}
 	lines := strings.SplitN(string(data), "\n", 2)
 	if len(lines) != 2 {
-		return false, "", fmt.Errorf("invalid cache file: %s", path)
+		return false, "", fmt.Errorf("invalid cache file: %s; %d lines, expected 2", path, len(lines))
 	}
 	switch lines[0] {
 	case "true":