diff --git a/nvm.sh b/nvm.sh
index 39a07e1..d6dd751 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -2675,6 +2675,7 @@ nvm() {
       # Prepend current version
       PATH="$(nvm_prepend_path "$PATH" "$NVM_VERSION_DIR/bin")"
       if nvm_has manpath; then
+        local MANPATH
         if [ -z "$MANPATH" ]; then
           MANPATH=$(manpath)
         fi