diff --git a/src/Bar.svelte b/src/Bar.svelte
index 8f77228..2bfd6cf 100644
--- a/src/Bar.svelte
+++ b/src/Bar.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'bar'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'bar', TData, TLabel>, 'type'> {
-    chart: ChartJS<'bar', TData, TLabel> | null;
+    chart?: ChartJS<'bar', TData, TLabel> | null;
   }
 
   ChartJS.register(BarController);
diff --git a/src/Bubble.svelte b/src/Bubble.svelte
index a1dc6e2..fa9bc06 100644
--- a/src/Bubble.svelte
+++ b/src/Bubble.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'bubble'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'bubble', TData, TLabel>, 'type'> {
-    chart: ChartJS<'bubble', TData, TLabel> | null;
+    chart?: ChartJS<'bubble', TData, TLabel> | null;
   }
 
   ChartJS.register(BubbleController);
diff --git a/src/Chart.svelte b/src/Chart.svelte
index ddb64a9..91ba74f 100644
--- a/src/Chart.svelte
+++ b/src/Chart.svelte
@@ -10,7 +10,7 @@
     TData = DefaultDataPoint<TType>,
     TLabel = unknown
   > extends ChartBaseProps<TType, TData, TLabel> {
-    chart: ChartJS<TType, TData, TLabel> | null;
+    chart?: ChartJS<TType, TData, TLabel> | null;
   }
 
   function clean(props: SvelteAllProps) {
diff --git a/src/Doughnut.svelte b/src/Doughnut.svelte
index 54f97c8..ea019a0 100644
--- a/src/Doughnut.svelte
+++ b/src/Doughnut.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'doughnut'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'doughnut', TData, TLabel>, 'type'> {
-    chart: ChartJS<'doughnut', TData, TLabel> | null;
+    chart?: ChartJS<'doughnut', TData, TLabel> | null;
   }
 
   ChartJS.register(DoughnutController);
diff --git a/src/Line.svelte b/src/Line.svelte
index 71a8805..17d7ce2 100644
--- a/src/Line.svelte
+++ b/src/Line.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'line'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'line', TData, TLabel>, 'type'> {
-    chart: ChartJS<'line', TData, TLabel> | null;
+    chart?: ChartJS<'line', TData, TLabel> | null;
   }
 
   ChartJS.register(LineController);
diff --git a/src/Pie.svelte b/src/Pie.svelte
index 12a054f..7cb11b4 100644
--- a/src/Pie.svelte
+++ b/src/Pie.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'pie'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'pie', TData, TLabel>, 'type'> {
-    chart: ChartJS<'pie', TData, TLabel> | null;
+    chart?: ChartJS<'pie', TData, TLabel> | null;
   }
 
   ChartJS.register(PieController);
diff --git a/src/PolarArea.svelte b/src/PolarArea.svelte
index 8e117e1..eaa879a 100644
--- a/src/PolarArea.svelte
+++ b/src/PolarArea.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'polarArea'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'polarArea', TData, TLabel>, 'type'> {
-    chart: ChartJS<'polarArea', TData, TLabel> | null;
+    chart?: ChartJS<'polarArea', TData, TLabel> | null;
   }
 
   ChartJS.register(PolarAreaController);
diff --git a/src/Radar.svelte b/src/Radar.svelte
index bef15be..2890744 100644
--- a/src/Radar.svelte
+++ b/src/Radar.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'radar'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'radar', TData, TLabel>, 'type'> {
-    chart: ChartJS<'radar', TData, TLabel> | null;
+    chart?: ChartJS<'radar', TData, TLabel> | null;
   }
 
   ChartJS.register(RadarController);
diff --git a/src/Scatter.svelte b/src/Scatter.svelte
index 74f45a0..f44d9c4 100644
--- a/src/Scatter.svelte
+++ b/src/Scatter.svelte
@@ -7,7 +7,7 @@
 
   interface $$Props<TData = DefaultDataPoint<'scatter'>, TLabel = unknown>
     extends Omit<ChartBaseProps<'scatter', TData, TLabel>, 'type'> {
-    chart: ChartJS<'scatter', TData, TLabel> | null;
+    chart?: ChartJS<'scatter', TData, TLabel> | null;
   }
 
   ChartJS.register(ScatterController);