diff --git a/evaluation/case-studies/builder-provider-api.md b/evaluation/case-studies/builder-provider-api.md
index d5a424c..c2abcf1 100644
--- a/evaluation/case-studies/builder-provider-api.md
+++ b/evaluation/case-studies/builder-provider-api.md
@@ -101,7 +101,7 @@ struct DefaultCredentialsChain {
 impl DefaultCredentialsChain {
     fn with_custom_credential_source(self, provider: impl ProvideCredentials) {
         // Coerce `impl ProvideCredentials` to `Box<dyn ProvideCredentialsDyn>`
-        Self { provider: Box::new(credentials_source), ..self }
+        Self { credentials_source: Box::new(provider), ..self }
     }
 }
 ```
@@ -125,7 +125,7 @@ impl DefaultCredentialsChain {
         provider: impl ProvideCredentials<provide_credentials(): Send>
     ) {
         // Coerce `impl ProvideCredentials` to `Box<dyn ProvideCredentialsDyn>`
-        Self { provider: Box::new(credentials_source), ..self }
+        Self { credentials_source: Box::new(provider), ..self }
     }
 }
 ```
@@ -163,4 +163,4 @@ The SDK uses this same idiom several times:
 
 ## Future improvements
 
-With AFIDT, we can drop the `ProvideCredentialsDyn` trait and just use `Box<dyn ProvideCredentials>` as is. Refactoring the API to use AFIDT is a totally internal-facing change.
\ No newline at end of file
+With AFIDT, we can drop the `ProvideCredentialsDyn` trait and just use `Box<dyn ProvideCredentials>` as is. Refactoring the API to use AFIDT is a totally internal-facing change.