diff --git a/action.yml b/action.yml
index cdec776..4e042ed 100644
--- a/action.yml
+++ b/action.yml
@@ -123,7 +123,8 @@
                     "diagnostic-endpoint": "${{ inputs.diagnostic-endpoint }}",
                     "log-directives": "${{ inputs.log-directives }}",
                     "logger": "${{ inputs.logger }}",
-                    "_internal-strict-mode": "${{ inputs._internal-strict-mode }}"
+                    "_internal-strict-mode": "${{ inputs._internal-strict-mode }}",
+                    "determinate": true
                 }
             }
         ]
diff --git a/tools/generate.py b/tools/generate.py
index 311d25e..884f587 100644
--- a/tools/generate.py
+++ b/tools/generate.py
@@ -163,6 +163,9 @@ for input_name in keep_inputs:
     except KeyError:
         faults.append(f"Input action is missing this 'keep_inputs' input: {input_name}")
 
+# Turn on Determinate Nix
+nix_install_step["with"]["determinate"] = True
+
 result["runs"]["steps"].append(nix_install_step)
 
 # Delete inputs we specifically do not want to support without a specific and known use case