diff --git a/jOOQ/src/main/java/org/jooq/tools/json/JSONValue.java b/jOOQ/src/main/java/org/jooq/tools/json/JSONValue.java
index 76e80f9004..2aaf192ba0 100644
--- a/jOOQ/src/main/java/org/jooq/tools/json/JSONValue.java
+++ b/jOOQ/src/main/java/org/jooq/tools/json/JSONValue.java
@@ -54,7 +54,7 @@ public class JSONValue {
 
         if (value instanceof Double d) {
             if (d.isInfinite() || d.isNaN())
-                out.write("null");
+                out.write("\"NaN\"");
             else
                 out.write(value.toString());
 
@@ -63,7 +63,7 @@ public class JSONValue {
 
         if (value instanceof Float f) {
             if (f.isInfinite() || f.isNaN())
-                out.write("null");
+                out.write("\"NaN\"");
             else
                 out.write(value.toString());