diff --git a/cmd/span-compare/main.go b/cmd/span-compare/main.go
index 1058967a..4bc8e7d6 100644
--- a/cmd/span-compare/main.go
+++ b/cmd/span-compare/main.go
@@ -147,7 +147,6 @@ var SourceNames = map[string]string{
 	"103": "Margaret Herrick Library",
 	"104": "WTI",
 	"105": "Springer Journals",
-	"105": "Springer Journals",
 	"106": "Primary Sources for Slavic Studies",
 	"107": "Heidelberger historische Bestände digital",
 	"108": "De Gruyter eBooks Open Access",