diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16bb580..ef35405 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ### Change Log for Node-RED Worldmap
 
+ - v2.23.5 - Fix addtoheatmap. Issue #192
  - v2.23.4 - Fix opacity of area borders
  - v2.23.3 - Fix initial load of maps
  - v2.23.2 - Add convex-hull example
diff --git a/README.md b/README.md
index 3a50c3f..ac8df68 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ map web page for plotting "things" on.
 
 ### Updates
 
+- v2.23.5 - Fix addtoheatmap. Issue #192
 - v2.23.4 - Fix opacity of area borders
 - v2.23.3 - Fix initial load of maps
 - v2.23.2 - Add convex-hull example
diff --git a/worldmap/worldmap.js b/worldmap/worldmap.js
index 2979511..e8ba5fe 100644
--- a/worldmap/worldmap.js
+++ b/worldmap/worldmap.js
@@ -1997,7 +1997,7 @@ function setMarker(data) {
         fb.action = "click";
         ws.send(JSON.stringify(fb));
     });
-    if (heat && ((data.addtoheatmap !== "false") || (!data.hasOwnProperty("addtoheatmap")))) { // Added to give ability to control if points from active layer contribute to heatmap
+    if (heat && ((data.addtoheatmap != false) || (!data.hasOwnProperty("addtoheatmap")))) { // Added to give ability to control if points from active layer contribute to heatmap
         if (heatAll || map.hasLayer(layers[lay])) { heat.addLatLng(lli); }
     }
     markers[data.name] = marker;