diff --git a/DESCRIPTION b/DESCRIPTION
index a01249b95..434a45801 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -80,7 +80,8 @@ Imports:
     later (>= 0.7.1),
     promises (>= 0.1.0.9001),
     tools,
-    crayon
+    crayon,
+    rlang
 Suggests:
     datasets,
     Cairo (>= 1.5-5),
diff --git a/R/render-plot.R b/R/render-plot.R
index c6b1c7e7e..9cce3c9c0 100644
--- a/R/render-plot.R
+++ b/R/render-plot.R
@@ -555,9 +555,11 @@ find_panel_info_api <- function(b) {
     # ggplot object. The original uses quoted expressions; convert to
     # character.
     mapping <- layers$mapping[[1]]
-    # lapply'ing as.character results in unexpected behavior for expressions
-    # like `wt/2`; deparse handles it correctly.
-    mapping <- lapply(mapping, deparse)
+    # In ggplot2 <=2.2.1, the mappings are expressions. In later versions, they
+    # are quosures. `deparse(quo_squash(x))` will handle both cases.
+    # as.character results in unexpected behavior for expressions like `wt/2`,
+    # which is why we use deparse.
+    mapping <- lapply(mapping, function(x) deparse(rlang::quo_squash(x)))
 
     # If either x or y is not present, give it a NULL entry.
     mapping <- mergeVectors(list(x = NULL, y = NULL), mapping)