diff --git a/src/communication/EmscriptenCommunication.cpp b/src/communication/EmscriptenCommunication.cpp
index d5504add7e..d929a204cb 100644
--- a/src/communication/EmscriptenCommunication.cpp
+++ b/src/communication/EmscriptenCommunication.cpp
@@ -41,7 +41,7 @@ EmscriptenCommunication::EmscriptenCommunication(const std::vector<std::string>&
 
 void EmscriptenCommunication::sendGCodePrefix(const std::string& prefix) const
 {
-    emscripten_run_script(fmt::format("globalThis[\"{}\"]({})", gcode_prefix_handler_, prefix).c_str());
+    emscripten_run_script(fmt::format("globalThis[\"{}\"](\"{}\")", gcode_prefix_handler_, prefix).c_str());
 }
 
 void EmscriptenCommunication::sendProgress(double progress) const