diff --git a/src/rules/no-system-props.js b/src/rules/no-system-props.js
index d5dfafd..79b8bf4 100644
--- a/src/rules/no-system-props.js
+++ b/src/rules/no-system-props.js
@@ -23,6 +23,7 @@ const excludedComponentProps = new Map([
   ['Blankslate', new Set(['border'])],
   ['Button', new Set(['alignContent'])],
   ['CircleOcticon', new Set(['size'])],
+  ['ConfirmationDialog', new Set(['width', 'height'])],
   ['Dialog', new Set(['width', 'height', 'position'])],
   ['IssueLabelToken', new Set(['size'])],
   ['Overlay', new Set(['width', 'height', 'maxHeight', 'position', 'top', 'right', 'bottom', 'left'])],