diff --git a/action.yml b/action.yml
index 732b910..babdfd3 100644
--- a/action.yml
+++ b/action.yml
@@ -51,7 +51,7 @@ runs:
 
     - name: Export Godot project on Linux
       id: export-linux
-      if: ${{ runner.os == 'Linux' }}
+      if: ${{ runner.os == 'linux' }}
       shell: bash
       env:
         GODOT_VERSION: "${{ inputs.godot-version }}"
@@ -67,7 +67,7 @@ runs:
 
     - name: Export Godot project on macOS
       id: export-macos
-      if: ${{ runner.os == 'macOS' }}
+      if: ${{ runner.os == 'macos' }}
       shell: bash
       env:
         GODOT_VERSION: "${{ inputs.godot-version }}"
@@ -83,7 +83,7 @@ runs:
 
     - name: Export Godot project on Windows
       id: export-windows
-      if: ${{ runner.os == 'Windows' }}
+      if: ${{ runner.os == 'windows' }}
       shell: powershell
       env:
         GODOT_VERSION: "${{ inputs.godot-version }}"