diff --git a/src/text-editor-component.js b/src/text-editor-component.js
index 5667a733e..8dda2297d 100644
--- a/src/text-editor-component.js
+++ b/src/text-editor-component.js
@@ -2118,6 +2118,7 @@ class TextEditorComponent {
       // rendered start row accurately. 😥
       this.populateVisibleRowRange(renderedStartRow)
       this.props.model.setEditorWidthInChars(this.getScrollContainerClientWidthInBaseCharacters())
+      this.derivedDimensionsCache = {}
 
       this.suppressUpdates = false
     }