diff --git a/ion/src/device/external_flash.cpp b/ion/src/device/external_flash.cpp
index 0c201a3ec..8e94ef89d 100644
--- a/ion/src/device/external_flash.cpp
+++ b/ion/src/device/external_flash.cpp
@@ -82,8 +82,8 @@ static void set_as_memory_mapped() {
   send_command_full(
     QUADSPI::CCR::FunctionalMode::MemoryMapped,
     DefaultOperatingMode,
-    Command::ReadData,
-    0, 0, nullptr, 0
+    Command::FastRead,
+    0, 8, nullptr, 0
   );
 }