diff --git a/.bashrc b/.bashrc
index b8b5964..6d2f65a 100644
--- a/.bashrc
+++ b/.bashrc
@@ -1,11 +1,19 @@
 # .bashrc
-
 # Source global definitions
 if [[ -r /etc/bashrc ]]; then
   . /etc/bashrc
 fi
 
-# Source .bashrc.d
-for file in ~/.bashrc.d/*.bashrc; do
-  . "$file"
-done
+# Bash 4 or bust
+if (( BASH_VERSINFO[0] < 4 )); then
+  echo "Please get a newer version of Bash."
+  echo "Your bashrc won't work otherwise."
+else
+  # Source .bashrc.d
+  for file in ~/.bashrc.d/*.bashrc; do
+    . "$file"
+  done
+
+  unset -v file
+fi
+