diff --git a/keyserver/bash/source-nvm.sh b/keyserver/bash/source-nvm.sh
index 28aec9c25..b7166fe57 100644
--- a/keyserver/bash/source-nvm.sh
+++ b/keyserver/bash/source-nvm.sh
@@ -1,17 +1,20 @@
 #!/usr/bin/env sh
 
 # source as: logged in user
 # source from: package.json (via npm/yarn scripts)
 
 unset PREFIX
 
 # Nix controls the version of node within the development shell
 [ -n "$IN_NIX_SHELL" ] && return 0
 
 # Intel Mac
+# shellcheck source=/dev/null
 [ -s "/usr/local/opt/nvm/nvm.sh" ] && . "/usr/local/opt/nvm/nvm.sh"
 # ARM-based Mac
+# shellcheck source=/dev/null
 [ -s "/opt/homebrew/opt/nvm/nvm.sh" ] && . "/opt/homebrew/opt/nvm/nvm.sh"
 # Ubuntu
+# shellcheck source=/dev/null
 [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
 nvm install --no-progress