diff --git a/nvm.sh b/nvm.sh
index c26d229..0f2db7e 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -144,6 +144,8 @@ nvm_version_dir() {
   NVM_WHICH_DIR="$1"
   if [ -z "$NVM_WHICH_DIR" ] || [ "_$NVM_WHICH_DIR" = "_new" ]; then
     echo "$NVM_DIR/versions/node"
+  elif [ "_$NVM_WHICH_DIR" = "_iojs" ]; then
+    echo "$NVM_DIR/versions/io.js"
   elif [ "_$NVM_WHICH_DIR" = "_old" ]; then
     echo "$NVM_DIR"
   else
diff --git a/test/fast/Unit tests/nvm_version_dir b/test/fast/Unit tests/nvm_version_dir
index f6346fa..6fc880a 100755
--- a/test/fast/Unit tests/nvm_version_dir	
+++ b/test/fast/Unit tests/nvm_version_dir	
@@ -5,6 +5,7 @@ die () { echo $@ ; exit 1; }
 . ../../../nvm.sh
 
 [ "$(nvm_version_dir)" = "$NVM_DIR/versions/node" ] || die '"nvm_version_dir" did not return new dir path'
+[ "$(nvm_version_dir iojs)" = "$NVM_DIR/versions/io.js" ] || die '"nvm_version_dir iojs" did not return iojs dir path'
 [ "$(nvm_version_dir new)" = "$(nvm_version_dir)" ] || die '"nvm_version_dir new" did not return new dir path'
 [ "$(nvm_version_dir old)" = "$NVM_DIR" ] || die '"nvm_version_dir old" did not return old dir path'
 [ "$(nvm_version_dir foo 2>&1)" = "unknown version dir" ] || die '"nvm_version_dir foo" did not error out'