diff --git a/remote-command/action.yml b/remote-command/action.yml
index f6d26f5..99e9606 100644
--- a/remote-command/action.yml
+++ b/remote-command/action.yml
@@ -11,7 +11,7 @@ inputs:
     required: true
   key-path:
     required: false
-    default: ~/.ssh/deploy_key
+    default: ""
   command:
     required: true
 
@@ -22,7 +22,13 @@ runs:
       run: |
         set -eu
 
-        ssh -p ${{ inputs.port }} -i "${{ inputs.key-path }}" \
+        KEY_PATH="${{ inputs.key-path }}"
+        if [ -z "$KEY_PATH" ]; then
+          KEY_PATH="$HOME/.ssh/deploy_key"
+        fi
+
+        ssh -p "${{ inputs.port }}" -i "$KEY_PATH" \
+          -o IdentitiesOnly=yes \
           "${{ inputs.user }}@${{ inputs.host }}" \
           'bash -se' << 'EOF'
         ${{ inputs.command }}