diff --git a/dnet-pace-core/src/main/java/eu/dnetlib/pace/distance/eval/ScoreResult.java b/dnet-pace-core/src/main/java/eu/dnetlib/pace/distance/eval/ScoreResult.java
index a61cf6e15c..b5cdad7305 100644
--- a/dnet-pace-core/src/main/java/eu/dnetlib/pace/distance/eval/ScoreResult.java
+++ b/dnet-pace-core/src/main/java/eu/dnetlib/pace/distance/eval/ScoreResult.java
@@ -50,6 +50,7 @@ public class ScoreResult {
 	@Override
 	public String toString() {
 		final GsonBuilder b = new GsonBuilder();
+		b.serializeSpecialFloatingPointValues();
 		return b.setPrettyPrinting().create().toJson(this);
 	}
 }