diff --git a/implementation/src/main/java/io/smallrye/config/ConfigValue.java b/implementation/src/main/java/io/smallrye/config/ConfigValue.java
index a00fea379..138719f26 100644
--- a/implementation/src/main/java/io/smallrye/config/ConfigValue.java
+++ b/implementation/src/main/java/io/smallrye/config/ConfigValue.java
@@ -107,7 +107,7 @@ public static class ConfigValueBuilder {
         private String value;
         private String configSourceName;
         private int configSourceOrdinal;
-        private int lineNumber;
+        private int lineNumber = -1;
 
         public ConfigValueBuilder withName(final String name) {
             this.name = name;