diff --git a/nvm.sh b/nvm.sh
index 4a95dc5..8683949 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -2159,7 +2159,7 @@ nvm_npm_global_modules() {
 
 nvm_die_on_prefix() {
   local NVM_DELETE_PREFIX
-  NVM_DELETE_PREFIX="$1"
+  NVM_DELETE_PREFIX="${1-}"
   case "${NVM_DELETE_PREFIX}" in
     0 | 1) ;;
     *)
@@ -2168,9 +2168,11 @@ nvm_die_on_prefix() {
     ;;
   esac
   local NVM_COMMAND
-  NVM_COMMAND="$2"
-  if [ -z "${NVM_COMMAND}" ]; then
-    nvm_err 'Second argument "nvm command" must be nonempty'
+  NVM_COMMAND="${2-}"
+  local NVM_VERSION_DIR
+  NVM_VERSION_DIR="${3-}"
+  if [ -z "${NVM_COMMAND}" ] || [ -z "${NVM_VERSION_DIR}" ]; then
+    nvm_err 'Second argument "nvm command", and third argument "nvm version dir", must both be nonempty'
     return 2
   fi
 
@@ -2210,7 +2212,7 @@ nvm_die_on_prefix() {
   local NVM_OS
   NVM_OS="$(nvm_get_os)"
   NVM_NPM_PREFIX="$(npm config --loglevel=warn get prefix)"
-  if ! (nvm_tree_contains_path "${NVM_DIR}" "${NVM_NPM_PREFIX}" >/dev/null 2>&1); then
+  if [ "${NVM_VERSION_DIR}" != "${NVM_NPM_PREFIX}" ] && ! (nvm_tree_contains_path "${NVM_VERSION_DIR}" "${NVM_NPM_PREFIX}" >/dev/null 2>&1); then
     if [ "_${NVM_DELETE_PREFIX}" = "_1" ]; then
       npm config --loglevel=warn delete prefix
     else
@@ -3140,7 +3142,7 @@ nvm() {
         if [ "${NVM_SILENT:-0}" -eq 1 ]; then
           NVM_USE_CMD="${NVM_USE_CMD} --silent"
         fi
-        if ! nvm_die_on_prefix "${NVM_DELETE_PREFIX}" "${NVM_USE_CMD}"; then
+        if ! nvm_die_on_prefix "${NVM_DELETE_PREFIX}" "${NVM_USE_CMD}" "${NVM_VERSION_DIR}"; then
           return 11
         fi
       fi
diff --git a/test/fast/Unit tests/nvm_die_on_prefix b/test/fast/Unit tests/nvm_die_on_prefix
index 7429cb8..c9b99e1 100755
--- a/test/fast/Unit tests/nvm_die_on_prefix	
+++ b/test/fast/Unit tests/nvm_die_on_prefix	
@@ -22,13 +22,13 @@ EXIT_CODE="$(nvm_die_on_prefix 2 >/dev/null 2>&1; echo $?)"
 [ "_$EXIT_CODE" = "_1" ] || die "'nvm_die_on_prefix' did not exit with 1; got "$EXIT_CODE""
 
 OUTPUT="$(nvm_die_on_prefix 0 2>&1)"
-EXPECTED_OUTPUT="Second argument \"nvm command\" must be nonempty"
+EXPECTED_OUTPUT='Second argument "nvm command", and third argument "nvm version dir", must both be nonempty'
 EXIT_CODE="$(nvm_die_on_prefix 0 >/dev/null 2>&1; echo $?)"
 [ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "'nvm_die_on_prefix 0' did not error with '$EXPECTED_OUTPUT'; got '$OUTPUT'"
 [ "_$EXIT_CODE" = "_2" ] || die "'nvm_die_on_prefix 0' did not exit with 2; got '$EXIT_CODE'"
 
 nvm_has() { return 1; } # ie, npm is not installed
-OUTPUT="$(nvm_die_on_prefix 0 foo 2>&1)"
+OUTPUT="$(nvm_die_on_prefix 0 version_dir foo 2>&1)"
 [ -z "$OUTPUT" ] || die "nvm_die_on_prefix was not a noop when nvm_has returns 1, got '$OUTPUT'"
 
 nvm_has() { return 0; }
@@ -40,27 +40,27 @@ npm() {
     echo "$(nvm_version_dir new)/good prefix"
   fi
 }
-OUTPUT="$(nvm_die_on_prefix 0 foo 2>&1)"
+OUTPUT="$(nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" 2>&1)"
 [ -z "$OUTPUT" ] || die "'nvm_die_on_prefix' was not a noop when prefix is good; got '$OUTPUT'"
 
-OUTPUT="$(PREFIX=bar nvm_die_on_prefix 0 foo 2>&1)"
+OUTPUT="$(PREFIX=bar nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" 2>&1)"
 EXPECTED_OUTPUT='nvm is not compatible with the "PREFIX" environment variable: currently set to "bar"
 Run `unset PREFIX` to unset it.'
-EXIT_CODE="$(export PREFIX=bar ; nvm_die_on_prefix 0 foo >/dev/null 2>&1; echo $?)"
+EXIT_CODE="$(export PREFIX=bar ; nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" >/dev/null 2>&1; echo $?)"
 [ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "'PREFIX=bar nvm_die_on_prefix 0 foo' did not error with '$EXPECTED_OUTPUT'; got '$OUTPUT'"
 [ "_$EXIT_CODE" = "_3" ] || die "'PREFIX=bar nvm_die_on_prefix 0 foo' did not exit with 3; got '$EXIT_CODE'"
 
-OUTPUT="$(export NPM_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo 2>&1)"
+OUTPUT="$(export NPM_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" 2>&1)"
 EXPECTED_OUTPUT='nvm is not compatible with the "NPM_CONFIG_PREFIX" environment variable: currently set to "bar"
 Run `unset NPM_CONFIG_PREFIX` to unset it.'
-EXIT_CODE="$(export NPM_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo >/dev/null 2>&1; echo $?)"
+EXIT_CODE="$(export NPM_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" >/dev/null 2>&1; echo $?)"
 [ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "'NPM_CONFIG_PREFIX=bar nvm_die_on_prefix 0 foo' did not error with '$EXPECTED_OUTPUT'; got '$OUTPUT'"
 [ "_$EXIT_CODE" = "_4" ] || die "'NPM_CONFIG_PREFIX=bar nvm_die_on_prefix 0 foo' did not exit with 4; got '$EXIT_CODE'"
 
-OUTPUT="$(export npm_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo 2>&1)"
+OUTPUT="$(export npm_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" 2>&1)"
 EXPECTED_OUTPUT='nvm is not compatible with the "npm_CONFIG_PREFIX" environment variable: currently set to "bar"
 Run `unset npm_CONFIG_PREFIX` to unset it.'
-EXIT_CODE="$(export npm_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo >/dev/null 2>&1; echo $?)"
+EXIT_CODE="$(export npm_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" >/dev/null 2>&1; echo $?)"
 [ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "'npm_CONFIG_PREFIX=bar nvm_die_on_prefix 0 foo' did not error with '$EXPECTED_OUTPUT'; got '$OUTPUT'"
 [ "_$EXIT_CODE" = "_4" ] || die "'npm_CONFIG_PREFIX=bar nvm_die_on_prefix 0 foo' did not exit with 4; got '$EXIT_CODE'"
 
@@ -71,10 +71,10 @@ npm() {
     echo "./bad prefix"
   fi
 }
-OUTPUT="$(nvm_die_on_prefix 0 foo 2>&1)"
+OUTPUT="$(nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" 2>&1)"
 EXPECTED_OUTPUT="nvm is not compatible with the npm config \"prefix\" option: currently set to \"./bad prefix\"
 Run \`npm config delete prefix\` or \`foo\` to unset it."
-EXIT_CODE="$(nvm_die_on_prefix 0 foo >/dev/null 2>&1; echo $?)"
+EXIT_CODE="$(nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" >/dev/null 2>&1; echo $?)"
 [ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "'nvm_die_on_prefix 0 foo' did not error with '$EXPECTED_OUTPUT' with bad prefix set; got '$OUTPUT'"
 [ "_$EXIT_CODE" = "_10" ] || die "'nvm_die_on_prefix 0 foo' did not exit with 10 with bad prefix set; got '$EXIT_CODE'"