diff --git a/R/backports.R b/R/backports.R
new file mode 100644
index 0000000..6338185
--- /dev/null
+++ b/R/backports.R
@@ -0,0 +1,4 @@
+
+if (getRversion() < "3.5.0") {
+  isFALSE <- function(x) identical(x, FALSE)
+}