diff --git a/py/circuitpy_mpconfig.h b/py/circuitpy_mpconfig.h
index 0049958269..235e81e48b 100644
--- a/py/circuitpy_mpconfig.h
+++ b/py/circuitpy_mpconfig.h
@@ -64,6 +64,7 @@
 #define MICROPY_ENABLE_FINALISER         (1)
 #define MICROPY_ENABLE_GC                (1)
 #define MICROPY_ENABLE_SOURCE_LINE       (1)
+#define MICROPY_EPOCH_IS_1970            (1)
 #define MICROPY_ERROR_REPORTING          (MICROPY_ERROR_REPORTING_NORMAL)
 #define MICROPY_FLOAT_HIGH_QUALITY_HASH  (0)
 #define MICROPY_FLOAT_IMPL               (MICROPY_FLOAT_IMPL_FLOAT)
@@ -205,7 +206,6 @@ typedef long mp_off_t;
 #define MICROPY_PY_URE_MATCH_GROUPS           (CIRCUITPY_RE)
 #define MICROPY_PY_URE_MATCH_SPAN_START_END   (CIRCUITPY_RE)
 #define MICROPY_PY_URE_SUB                    (CIRCUITPY_RE)
-#define MICROPY_EPOCH_IS_1970                 (0)
 
 // LONGINT_IMPL_xxx are defined in the Makefile.
 //