diff --git a/demos/sqlite/download_and_build_sqlite.sh b/demos/sqlite/download_and_build_sqlite.sh
index cf6ebad3..57e973e6 100755
--- a/demos/sqlite/download_and_build_sqlite.sh
+++ b/demos/sqlite/download_and_build_sqlite.sh
@@ -14,12 +14,16 @@ SPEEDTEST=speedtest1
                && rm -f $SQLITE.tar.gz
 [ -e $DEMO ] && rm -f $DEMO
 echo -e "Starting to build $DEMO ..."
-occlum-gcc -O2 -I$SQLITE_SRC sqlite_demo.c $SQLITE_SRC/sqlite3.c -lpthread -ldl -o $DEMO
+# Note:
+# It is necessary to add '-DSQLITE_MMAP_READWRITE' to enable SQLite to read and write on the file-backed memory directly.
+# This is because when app mmaps a file into memory, following writes on that file will not be reflected on the mapped memory.
+# TODO: We will fix this later.
+occlum-gcc -O2 -I$SQLITE_SRC -DSQLITE_MMAP_READWRITE sqlite_demo.c $SQLITE_SRC/sqlite3.c -lpthread -ldl -o $DEMO
 echo -e "Build $DEMO succeed"
 
 [ -e $SPEEDTEST ] && rm -f $SPEEDTEST && rm -f $SPEEDTEST.c
 echo -e "Starting to build $SPEEDTEST ..."
 wget https://raw.githubusercontent.com/sqlite/sqlite/version-3.33.0/test/$SPEEDTEST.c
-occlum-gcc -O6 -I$SQLITE_SRC -DNDEBUG=1 -DSQLITE_ENABLE_MEMSYS5 -DSQLITE_THREADSAFE=2 -DSQLITE_DEFAULT_WORKER_THREADS=32 $SPEEDTEST.c $SQLITE_SRC/sqlite3.c -lpthread -ldl -o $SPEEDTEST
+occlum-gcc -O6 -I$SQLITE_SRC -DNDEBUG=1 -DSQLITE_MMAP_READWRITE -DSQLITE_ENABLE_MEMSYS5 -DSQLITE_THREADSAFE=2 -DSQLITE_DEFAULT_WORKER_THREADS=32 $SPEEDTEST.c $SQLITE_SRC/sqlite3.c -lpthread -ldl -o $SPEEDTEST
 echo -e "Build $SPEEDTEST succeed"