diff --git a/extmod/machine_pinbase.c b/extmod/machine_pinbase.c
index 90c17d7ab..981dadf0f 100644
--- a/extmod/machine_pinbase.c
+++ b/extmod/machine_pinbase.c
@@ -24,10 +24,10 @@
  * THE SOFTWARE.
  */
 
-#include "py/mpconfig.h"
-#if MICROPY_PY_MACHINE
-
 #include "py/runtime.h"
+
+#if MICROPY_PY_MACHINE_PIN_BASE
+
 #include "extmod/modmachine.h"
 #include "extmod/virtpin.h"
 
@@ -84,4 +84,4 @@ MP_DEFINE_CONST_OBJ_TYPE(
     protocol, &pinbase_pin_p
     );
 
-#endif // MICROPY_PY_MACHINE
+#endif // MICROPY_PY_MACHINE_PIN_BASE
diff --git a/extmod/modmachine.c b/extmod/modmachine.c
index 311d5dc03..e3baea521 100644
--- a/extmod/modmachine.c
+++ b/extmod/modmachine.c
@@ -81,7 +81,10 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_time_pulse_us), MP_ROM_PTR(&machine_time_pulse_us_obj) },
     #endif
 
-    // Class for Signal.
+    // Classes for PinBase and Signal.
+    #if MICROPY_PY_MACHINE_PIN_BASE
+    { MP_ROM_QSTR(MP_QSTR_PinBase), MP_ROM_PTR(&machine_pinbase_type) },
+    #endif
     { MP_ROM_QSTR(MP_QSTR_Signal), MP_ROM_PTR(&machine_signal_type) },
 
     // Classes for software bus protocols.
diff --git a/ports/qemu-arm/modmachine.c b/ports/qemu-arm/modmachine.c
index 59694f92f..72eaad6ea 100644
--- a/ports/qemu-arm/modmachine.c
+++ b/ports/qemu-arm/modmachine.c
@@ -27,9 +27,6 @@
 // This file is never compiled standalone, it's included directly from
 // extmod/modmachine.c via MICROPY_PY_MACHINE_INCLUDEFILE.
 
-#define MICROPY_PY_MACHINE_EXTRA_GLOBALS \
-    { MP_ROM_QSTR(MP_QSTR_PinBase), MP_ROM_PTR(&machine_pinbase_type) }, \
-
 // This variable is needed for machine.soft_reset(), but the variable is otherwise unused.
 int pyexec_system_exit = 0;
 
diff --git a/ports/qemu-arm/mpconfigport.h b/ports/qemu-arm/mpconfigport.h
index 36ce2db84..3efa1412d 100644
--- a/ports/qemu-arm/mpconfigport.h
+++ b/ports/qemu-arm/mpconfigport.h
@@ -48,6 +48,7 @@
 #define MICROPY_PY_HASHLIB          (1)
 #define MICROPY_PY_MACHINE          (1)
 #define MICROPY_PY_MACHINE_INCLUDEFILE "ports/qemu-arm/modmachine.c"
+#define MICROPY_PY_MACHINE_PIN_BASE (1)
 #define MICROPY_PY_MICROPYTHON_MEM_INFO (1)
 #define MICROPY_USE_INTERNAL_PRINTF (1)
 #define MICROPY_VFS                 (1)
diff --git a/ports/unix/modmachine.c b/ports/unix/modmachine.c
index 9eacd5539..40d08d911 100644
--- a/ports/unix/modmachine.c
+++ b/ports/unix/modmachine.c
@@ -36,9 +36,6 @@
 #define MICROPY_PAGE_MASK (MICROPY_PAGE_SIZE - 1)
 #endif
 
-#define MICROPY_PY_MACHINE_EXTRA_GLOBALS \
-    { MP_ROM_QSTR(MP_QSTR_PinBase), MP_ROM_PTR(&machine_pinbase_type) }, \
-
 // This variable is needed for machine.soft_reset(), but the variable is otherwise unused.
 int pyexec_system_exit = 0;
 
diff --git a/ports/unix/variants/mpconfigvariant_common.h b/ports/unix/variants/mpconfigvariant_common.h
index 082938ed5..981babca9 100644
--- a/ports/unix/variants/mpconfigvariant_common.h
+++ b/ports/unix/variants/mpconfigvariant_common.h
@@ -116,3 +116,4 @@
 // Enable the "machine" module, mostly for machine.mem*.
 #define MICROPY_PY_MACHINE             (1)
 #define MICROPY_PY_MACHINE_PULSE       (1)
+#define MICROPY_PY_MACHINE_PIN_BASE    (1)
diff --git a/ports/windows/mpconfigport.h b/ports/windows/mpconfigport.h
index 9dce520c2..2e1521b9c 100644
--- a/ports/windows/mpconfigport.h
+++ b/ports/windows/mpconfigport.h
@@ -156,6 +156,7 @@
 #define MICROPY_PY_MACHINE          (1)
 #define MICROPY_PY_MACHINE_INCLUDEFILE "ports/unix/modmachine.c"
 #define MICROPY_PY_MACHINE_PULSE    (1)
+#define MICROPY_PY_MACHINE_PIN_BASE (1)
 #define MICROPY_MACHINE_MEM_GET_READ_ADDR   mod_machine_mem_get_addr
 #define MICROPY_MACHINE_MEM_GET_WRITE_ADDR  mod_machine_mem_get_addr