diff --git a/themes/agnoster.zsh-theme b/themes/agnoster.zsh-theme
index a6bb9c64a..35f2751ef 100644
--- a/themes/agnoster.zsh-theme
+++ b/themes/agnoster.zsh-theme
@@ -163,7 +163,7 @@ prompt_hg() {
 
 # Dir: current working directory
 prompt_dir() {
-  prompt_segment blue black '%~'
+  prompt_segment blue black "%${PROMPT_DIRTRIM:-}~"
 }
 
 # Virtualenv: current working virtualenv