diff --git a/migrate.go b/migrate.go
index 1fabd56..0a1c8cc 100644
--- a/migrate.go
+++ b/migrate.go
@@ -43,7 +43,7 @@ func (ms migrationSorter) Len() int      { return len(ms) }
 func (ms migrationSorter) Swap(i, j int) { ms[i], ms[j] = ms[j], ms[i] }
 func (ms migrationSorter) Less(i, j int) bool {
 	if ms[i].Version == ms[j].Version {
-		panic(fmt.Sprintf("goose: duplicate version %v detected", ms[i].Version))
+		panic(fmt.Sprintf("goose: duplicate version %v detected:\n%v\n%v", ms[i].Version, ms[i].Source, ms[j].Source))
 	}
 	return ms[i].Version < ms[j].Version
 }