diff --git a/types/plotly.js/index.d.ts b/types/plotly.js/index.d.ts
index 79542bde44051d..4402b1f1f05efe 100644
--- a/types/plotly.js/index.d.ts
+++ b/types/plotly.js/index.d.ts
@@ -1117,7 +1117,7 @@ export type AxisName = XAxisName | YAxisName;
 
 export interface LayoutAxis extends Axis {
     fixedrange: boolean;
-    scaleanchor: AxisName;
+    scaleanchor: AxisName | false;
     scaleratio: number;
     constrain: "range" | "domain";
     constraintoward: "left" | "center" | "right" | "top" | "middle" | "bottom";
diff --git a/types/plotly.js/test/core-tests.ts b/types/plotly.js/test/core-tests.ts
index 284cb995c683a1..42bda171f48872 100644
--- a/types/plotly.js/test/core-tests.ts
+++ b/types/plotly.js/test/core-tests.ts
@@ -42,6 +42,7 @@ const layout = {
         showgrid: false,
         zeroline: false,
         tickangle,
+        scaleanchor: false,
     },
     yaxis: {
         title: {
diff --git a/types/plotly.js/v2/index.d.ts b/types/plotly.js/v2/index.d.ts
index 95e77f6fef3a48..ce880957bb5dd5 100644
--- a/types/plotly.js/v2/index.d.ts
+++ b/types/plotly.js/v2/index.d.ts
@@ -1119,7 +1119,7 @@ export type AxisName = XAxisName | YAxisName;
 
 export interface LayoutAxis extends Axis {
     fixedrange: boolean;
-    scaleanchor: AxisName;
+    scaleanchor: AxisName | false;
     scaleratio: number;
     constrain: "range" | "domain";
     constraintoward: "left" | "center" | "right" | "top" | "middle" | "bottom";
diff --git a/types/plotly.js/v2/test/core-tests.ts b/types/plotly.js/v2/test/core-tests.ts
index 8a0437f27f056e..3c72675686f4a8 100644
--- a/types/plotly.js/v2/test/core-tests.ts
+++ b/types/plotly.js/v2/test/core-tests.ts
@@ -40,6 +40,7 @@ const layout = {
         showgrid: false,
         zeroline: false,
         tickangle,
+        scaleanchor: false,
     },
     yaxis: {
         title: "Percent",