diff --git a/ports/esp32/esp32_common.cmake b/ports/esp32/esp32_common.cmake
index 99fcebac3..dedef6d78 100644
--- a/ports/esp32/esp32_common.cmake
+++ b/ports/esp32/esp32_common.cmake
@@ -247,7 +247,6 @@ target_compile_definitions(${MICROPY_TARGET} PUBLIC
     ${MICROPY_DEF_CORE}
     ${MICROPY_DEF_BOARD}
     ${MICROPY_DEF_TINYUSB}
-    MICROPY_ESP_IDF_4=1
     MICROPY_VFS_FAT=1
     MICROPY_VFS_LFS2=1
     FFCONF_H=\"${MICROPY_OOFATFS_DIR}/ffconf.h\"