diff --git a/src/stack-cli.ts b/src/stack-cli.ts
index c606175..5c88afa 100644
--- a/src/stack-cli.ts
+++ b/src/stack-cli.ts
@@ -32,7 +32,7 @@ export class StackCLI {
     const stackYamlIdx = args.indexOf("--stack-yaml");
     const stackYamlArg = stackYamlIdx >= 0 ? args[stackYamlIdx + 1] : null;
 
-    this.config = process.env.STACK_YAML ?? stackYamlArg ?? "stack.yaml";
+    this.config = stackYamlArg ?? process.env.STACK_YAML ?? "stack.yaml";
 
     // Capture --resolver if given
     const resolverIdx = args.indexOf("--resolver");