diff --git a/ports/esp32/mpconfigport.h b/ports/esp32/mpconfigport.h
index 623f5f5161..3c49eb24ed 100644
--- a/ports/esp32/mpconfigport.h
+++ b/ports/esp32/mpconfigport.h
@@ -99,6 +99,7 @@
 #define MICROPY_PY_CMATH                    (1)
 #define MICROPY_PY_GC                       (1)
 #define MICROPY_PY_IO                       (1)
+#define MICROPY_PY_IO_IOBASE                (1)
 #define MICROPY_PY_IO_FILEIO                (1)
 #define MICROPY_PY_IO_BYTESIO               (1)
 #define MICROPY_PY_IO_BUFFEREDWRITER        (1)
diff --git a/ports/esp8266/mpconfigport.h b/ports/esp8266/mpconfigport.h
index 8a800f017f..97b3090867 100644
--- a/ports/esp8266/mpconfigport.h
+++ b/ports/esp8266/mpconfigport.h
@@ -56,6 +56,7 @@
 #define MICROPY_PY_MATH             (1)
 #define MICROPY_PY_CMATH            (0)
 #define MICROPY_PY_IO               (1)
+#define MICROPY_PY_IO_IOBASE        (1)
 #define MICROPY_PY_IO_FILEIO        (1)
 #define MICROPY_PY_STRUCT           (1)
 #define MICROPY_PY_SYS              (1)
diff --git a/ports/stm32/mpconfigport.h b/ports/stm32/mpconfigport.h
index 89a43f3bb9..a038664e83 100644
--- a/ports/stm32/mpconfigport.h
+++ b/ports/stm32/mpconfigport.h
@@ -108,6 +108,7 @@
 #define MICROPY_PY_MATH_SPECIAL_FUNCTIONS (1)
 #define MICROPY_PY_CMATH            (1)
 #define MICROPY_PY_IO               (1)
+#define MICROPY_PY_IO_IOBASE        (1)
 #define MICROPY_PY_IO_FILEIO        (MICROPY_VFS_FAT) // because mp_type_fileio/textio point to fatfs impl
 #define MICROPY_PY_SYS_MAXSIZE      (1)
 #define MICROPY_PY_SYS_EXIT         (1)
diff --git a/ports/unix/mpconfigport.h b/ports/unix/mpconfigport.h
index 016dabf9f4..e0f9d99957 100644
--- a/ports/unix/mpconfigport.h
+++ b/ports/unix/mpconfigport.h
@@ -104,6 +104,7 @@
 #define MICROPY_PY_MATH_SPECIAL_FUNCTIONS (1)
 #endif
 #define MICROPY_PY_CMATH            (1)
+#define MICROPY_PY_IO_IOBASE        (1)
 #define MICROPY_PY_IO_FILEIO        (1)
 #define MICROPY_PY_GC_COLLECT_RETVAL (1)
 #define MICROPY_MODULE_FROZEN_STR   (1)