diff --git a/src/LCDDisplay.cpp b/src/LCDDisplay.cpp
index 14e5bf1..86db08b 100644
--- a/src/LCDDisplay.cpp
+++ b/src/LCDDisplay.cpp
@@ -80,8 +80,8 @@ void LCDDisplay::writeLines(std::array<std::string, 4> lines) {
 
 /* writes string to line buffer at given pos*/
 void LCDDisplay::writeBuf(uint8_t row, uint8_t col, std::string str) {
-    // size_t max_copy = std::min(str.size(), sizeof(linebuf[row]) - col - 1);
-    std::memcpy(&linebuf[row][col], str.c_str(), str.size());  // will overflow
+    size_t len = std::min(str.size(), sizeof(linebuf[row]) - col);
+    std::memcpy(&linebuf[row][col], str.c_str(), len);  // will overflow
 }
 
 /* hyper optimized buffer flush command, writes whole disp with a single write */