diff --git a/lib/perfdata/influxdbwriter.cpp b/lib/perfdata/influxdbwriter.cpp
index 7e7137da8..c6fa2c2c3 100644
--- a/lib/perfdata/influxdbwriter.cpp
+++ b/lib/perfdata/influxdbwriter.cpp
@@ -228,7 +228,7 @@ String InfluxdbWriter::FormatInteger(int val)
 
 String InfluxdbWriter::FormatBoolean(bool val)
 {
-	return String(val);
+	return val ? "true" : "false";
 }
 
 void InfluxdbWriter::SendPerfdata(const Dictionary::Ptr& tmpl, const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, double ts)