diff --git a/http/data_source.go b/http/data_source.go
index fba87231..a61da023 100644
--- a/http/data_source.go
+++ b/http/data_source.go
@@ -70,8 +70,8 @@ func dataSourceRead(d *schema.ResourceData, meta interface{}) error {
 
 	// Append `ca_certificate` to the system CA cert pool
 	if caCert != "" {
-		if err := caCertPool.AppendCertsFromPEM([]byte(caCert)); !err {
-			return fmt.Errorf("Error when adding CA certificate: %s", err)
+		if ok := caCertPool.AppendCertsFromPEM([]byte(caCert)); !ok {
+			return fmt.Errorf("Error when adding CA certificate to certificate pool")
 		}
 	}