diff --git a/component/ca/config.go b/component/ca/config.go
index 53cb98ab..d56809a1 100644
--- a/component/ca/config.go
+++ b/component/ca/config.go
@@ -13,6 +13,8 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+
+	C "github.com/metacubex/mihomo/constant"
 )
 
 var trustCerts []*x509.Certificate
@@ -117,7 +119,7 @@ func GetTLSConfig(tlsConfig *tls.Config, fingerprint string, customCA string, cu
 	var certificate []byte
 	var err error
 	if len(customCA) > 0 {
-		certificate, err = os.ReadFile(customCA)
+		certificate, err = os.ReadFile(C.Path.Resolve(customCA))
 		if err != nil {
 			return nil, fmt.Errorf("load ca error: %w", err)
 		}