diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f01d7c337..c2005e7aa 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -320,7 +320,7 @@ target_link_libraries(libavrdude
 
 # check if we are using emscripten
 if(EMSCRIPTEN)
-    set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} "-fPIC -O3 -s ENVIRONMENT=web -s ERROR_ON_UNDEFINED_SYMBOLS=1 -s WASM=1 -s FORCE_FILESYSTEM -s ASYNCIFY=1 -s INVOKE_RUN=0 -s WASM_BIGINT=1 -s MODULARIZE=1 -s \"EXPORTED_FUNCTIONS=['_startAvrdude','_malloc','_dataCallback']\" --bind -s EXPORTED_RUNTIME_METHODS='[\"cwrap\", \"writeStringToMemory\", \"FS\", \"allocate\"]'")
+    set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} "-fPIC -O3 -s ENVIRONMENT=web -s ERROR_ON_UNDEFINED_SYMBOLS=1 -s WASM=1 -s FORCE_FILESYSTEM -s ASYNCIFY=1 -s INVOKE_RUN=0 -s WASM_BIGINT=1 -s MODULARIZE=1 -s \"EXPORTED_FUNCTIONS=['_startAvrdude','_malloc','_dataCallback']\" --bind -s EXPORTED_RUNTIME_METHODS='[\"cwrap\", \"writeStringToMemory\", \"FS\", \"allocate\"]' -s EXPORT_ES6=1")
 endif ()
 
 add_executable(avrdude
@@ -361,4 +361,4 @@ install(TARGETS libavrdude
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/avrdude.conf" TYPE SYSCONF)
 install(FILES "avrdude.1"
         DESTINATION "${CMAKE_INSTALL_MANDIR}/man1"
-)
\ No newline at end of file
+)