diff --git a/app/src/main/cpp/main.cpp b/app/src/main/cpp/main.cpp
index ecf91f2..614820f 100644
--- a/app/src/main/cpp/main.cpp
+++ b/app/src/main/cpp/main.cpp
@@ -458,7 +458,7 @@ static std::vector<uint8_t> readFile(const char *path) {
 }
 
 static bool checkOtaZip() {
-    std::array<char, 128> buffer{};
+    std::array<char, 256> buffer{};
     std::string result;
     bool found = false;