diff --git a/spacelift/provider.go b/spacelift/provider.go
index f67a3544..21099cf5 100644
--- a/spacelift/provider.go
+++ b/spacelift/provider.go
@@ -225,7 +225,11 @@ func buildClientFromToken(token string) (*internal.Client, error) {
 
 func buildClientFromAPIKeyData(d *schema.ResourceData) (*internal.Client, error) {
 	// Since validation runs first, we can safely assume that the data is there.
-	endpoint := fmt.Sprintf("%s/graphql", d.Get("api_key_endpoint").(string))
+	
+	// Handle / at api_key_endpoint
+	endpoint := strings.TrimSuffix(d.Get("api_key_endpoint").(string), "/")
+	endpoint = fmt.Sprintf("%s/graphql", endpoint)
+	
 	apiKeyID := d.Get("api_key_id").(string)
 	apiKeySecret := d.Get("api_key_secret").(string)