diff --git a/zshrc b/zshrc
index 53fd4e8..6d64b03 100644
--- a/zshrc
+++ b/zshrc
@@ -172,7 +172,13 @@ if [[ ! -z "$cursor_block" && ! -z "$cursor_line" ]]; then
 fi
 
 # Frequntly used directories
-function frequent-directory() { export $1; hash -d $1 }
+function frequent-directory() {
+  # Replace - with _ in environment variable name.
+  local name=$(echo $1 | sed 's/^\(.*\)=.*$/\1/g' | sed 's/-/_/g')
+  local value=$(echo $1 | sed 's/^.*=\(.*$\)/\1/g')
+  export $name=$value
+  hash -d $1
+}
 frequent-directory Projects="$HOME/Projects"
 frequent-directory Sandbox="$HOME/Sandbox"