diff --git a/tools/serpapi/api.go b/tools/serpapi/api.go
index 1a7d7ffe..944b71fe 100644
--- a/tools/serpapi/api.go
+++ b/tools/serpapi/api.go
@@ -12,7 +12,7 @@ type request struct {
 	GoogleDomain string
 	CountryCode  string
 	LanguageCode string
-	ApiKey       string
+	APIKey       string
 }
 
 type response struct {
@@ -58,7 +58,7 @@ type result struct {
 func (r *request) Path() (string, error) {
 	urlValues := restclientgo.NewURLValues()
 	urlValues.Add("q", &r.Query)
-	urlValues.Add("api_key", &r.ApiKey)
+	urlValues.Add("api_key", &r.APIKey)
 
 	if r.GoogleDomain != "" {
 		urlValues.Add("google_domain", &r.GoogleDomain)
diff --git a/tools/serpapi/serpapi.go b/tools/serpapi/serpapi.go
index c524bff5..e4dfb3a8 100644
--- a/tools/serpapi/serpapi.go
+++ b/tools/serpapi/serpapi.go
@@ -54,7 +54,7 @@ func (t *Tool) WithLanguageCode(languageCode string) *Tool {
 	return t
 }
 
-func (t *Tool) WithApiKey(apiKey string) *Tool {
+func (t *Tool) WithAPIKey(apiKey string) *Tool {
 	t.apiKey = apiKey
 	return t
 }
@@ -77,7 +77,7 @@ func (t *Tool) fn(i Input) Output {
 		GoogleDomain: t.googleDomain,
 		CountryCode:  t.countryCode,
 		LanguageCode: t.languageCode,
-		ApiKey:       t.apiKey,
+		APIKey:       t.apiKey,
 	}
 	res := &response{}