diff --git a/DESCRIPTION b/DESCRIPTION
index 8ebc80a37b..1c8b0b25dc 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -42,7 +42,7 @@ Imports:
     vctrs,
     tibble,
     lazyeval (>= 0.2.0),
-    rlang,
+    rlang (>= 0.4.10),
     crosstalk,
     purrr,
     data.table,
diff --git a/R/utils.R b/R/utils.R
index 46a0e02f0c..dd0d182283 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -379,7 +379,9 @@ supply_highlight_attrs <- function(p) {
 
     # include one selectize dropdown per "valid" SharedData layer
     if (isTRUE(p$x$highlight$selectize)) {
-      p$x$selectize[[i]] <- list(
+      # Hash i (the crosstalk group id) so that it can be used
+      # as an HTML id client-side (i.e., key shouldn't contain spaces)
+      p$x$selectize[[rlang::hash(i)]] <- list(
         items = data.frame(value = k, label = k), group = i
       )
     }