diff --git a/src/arduino/arduino.ts b/src/arduino/arduino.ts
index 73619a7b..ea8b3a09 100644
--- a/src/arduino/arduino.ts
+++ b/src/arduino/arduino.ts
@@ -592,6 +592,9 @@ Please make sure the folder is not occupied by other procedures .`);
         if (fs.existsSync(toolPath)) {
             result.push(path.normalize(path.join(toolPath, "**")));
         }
+        // path of custom libraries
+        result.push(path.join(this._settings.sketchbookPath, "libraries", "**"));
+
         return result;
     }