diff --git a/nvm.sh b/nvm.sh
index ddb3a4ba19..0721219196 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -2352,7 +2352,7 @@ nvm_die_on_prefix() {
   # here, we avoid trying to replicate "which one wins" or testing the value; if any are defined, it errors
   # until none are left.
   local NVM_NPM_CONFIG_PREFIX_ENV
-  NVM_NPM_CONFIG_PREFIX_ENV="$(command env | nvm_grep -i ^NPM_CONFIG_PREFIX | command tail -1 | command awk -F '=' '{print $1}')"
+  NVM_NPM_CONFIG_PREFIX_ENV="$(command env | nvm_grep -i NPM_CONFIG_PREFIX | command tail -1 | command awk -F '=' '{print $1}')"
   if [ -n "${NVM_NPM_CONFIG_PREFIX_ENV-}" ]; then
     local NVM_CONFIG_VALUE
     eval "NVM_CONFIG_VALUE=\"\$${NVM_NPM_CONFIG_PREFIX_ENV}\""
diff --git a/test/fast/Unit tests/nvm_die_on_prefix b/test/fast/Unit tests/nvm_die_on_prefix
index 54c15f7f84..f06a9bf45f 100755
--- a/test/fast/Unit tests/nvm_die_on_prefix	
+++ b/test/fast/Unit tests/nvm_die_on_prefix	
@@ -84,9 +84,6 @@ EXIT_CODE="$(export npm_CONFIG_PREFIX=bar ; nvm_die_on_prefix 0 foo "$(nvm_versi
 [ "_$OUTPUT" = "_$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="$(export FOO='NPM_CONFIG_PREFIX' ; nvm_die_on_prefix 0 foo "$(nvm_version_dir new)" 2>&1)"
-[ -z "$OUTPUT" ] || die "'nvm_die_on_prefix' was not a noop; got '$OUTPUT'"
-
 # npmrc tests
 (
   cd "${TEST_DIR}"