diff --git a/R/render-plot.R b/R/render-plot.R
index 9ab869974..8fe0dc02c 100644
--- a/R/render-plot.R
+++ b/R/render-plot.R
@@ -95,7 +95,7 @@ renderPlot <- function(expr, width='auto', height='auto', res=72, ...,
   # displaylist, which is resolution independent.
   drawReactive <- reactive({
     # Don't invalidate when width/height changes.
-    dims <- isolate(getDims())
+    dims <- if (execOnResize) getDims() else isolate(getDims())
     pixelratio <- session$clientData$pixelratio %OR% 1
     p1 <- drawPlot(name, session, func, dims$width, dims$height, pixelratio, res)
     p1 <- promise::catch(p1, function(reason) {
diff --git a/TODO-promises.md b/TODO-promises.md
index e943d2f85..15cb6dc12 100644
--- a/TODO-promises.md
+++ b/TODO-promises.md
@@ -5,3 +5,4 @@
 - [x] Brushing not working; the mapping is null for ggplot.
 - [ ] ..stacktraceon../..stacktraceoff.. and stack traces in general
 - [ ] Non-async render functions should have their code all execute on the current tick. Otherwise order of execution will be surprising if they have side effects and explicit priorities.
+- [x] Respect execOnResize