diff --git a/port/linux/package/pikascript/pikascript-lib/PikaCV/PikaCV_Converter.c b/port/linux/package/pikascript/pikascript-lib/PikaCV/PikaCV_Converter.c
index e857cd05c..3053d99ec 100644
--- a/port/linux/package/pikascript/pikascript-lib/PikaCV/PikaCV_Converter.c
+++ b/port/linux/package/pikascript/pikascript-lib/PikaCV/PikaCV_Converter.c
@@ -175,13 +175,13 @@ void PikaCV_Converter_toGray(PikaObj* self, PikaObj* image) {
     uint8_t* data_new = arg_getBytes(arg_data_new);
     if (img->format == PikaCV_ImageFormat_Type_RGB888) {
         for (int i = 0; i < size_new; i++) {
-            data_new[i] = (data[i * 3] + data[i * 3 + 1] + data[i * 3 + 2]) / 3;
+            data_new[i] = (uint16_t)(data[i * 3] + data[i * 3 + 1] + data[i * 3 + 2]) / 3;
         }
         goto exit;
     }
     if (img->format == PikaCV_ImageFormat_Type_RGB565) {
         for (int i = 0; i < size_new; i++) {
-            data_new[i] = (data[i * 2] + data[i * 2 + 1]) / 2;
+            data_new[i] = (uint16_t)(data[i * 2] + data[i * 2 + 1]) >> 1;
         }
         goto exit;
     }
diff --git a/port/linux/test/PikaCV-test.cpp b/port/linux/test/PikaCV-test.cpp
index 39a14fb9b..3bf47ab98 100644
--- a/port/linux/test/PikaCV-test.cpp
+++ b/port/linux/test/PikaCV-test.cpp
@@ -6,7 +6,7 @@ TEST(PikaCV, test1) {
     PikaObj* pikaMain = newRootObj("pikaMain", New_PikaMain);
     /* run */
     __platform_printf("BEGIN\r\n");
-    pikaVM_runSingleFile(pikaMain, "../../examples/PikaCV/test1.py");
+    pikaVM_runSingleFile(pikaMain, "test/python/PikaCV_test1.py");
     /* collect */
     /* assert */
     /* deinit */