diff --git a/ports/rp2/mpconfigport.h b/ports/rp2/mpconfigport.h
index 9ba381030b..b3214acfc2 100644
--- a/ports/rp2/mpconfigport.h
+++ b/ports/rp2/mpconfigport.h
@@ -102,6 +102,7 @@
 #define MICROPY_PY_URE_SUB                      (1)
 #define MICROPY_PY_UHASHLIB                     (1)
 #define MICROPY_PY_UBINASCII                    (1)
+#define MICROPY_PY_UBINASCII_CRC32              (1)
 #define MICROPY_PY_UTIME_MP_HAL                 (1)
 #define MICROPY_PY_URANDOM                      (1)
 #define MICROPY_PY_URANDOM_EXTRA_FUNCS          (1)
diff --git a/ports/stm32/mpconfigport.h b/ports/stm32/mpconfigport.h
index 5998cd9085..174ef22f24 100644
--- a/ports/stm32/mpconfigport.h
+++ b/ports/stm32/mpconfigport.h
@@ -165,6 +165,7 @@
 #define MICROPY_PY_UCRYPTOLIB       (MICROPY_PY_USSL)
 #ifndef MICROPY_PY_UBINASCII
 #define MICROPY_PY_UBINASCII        (1)
+#define MICROPY_PY_UBINASCII_CRC32  (1)
 #endif
 #ifndef MICROPY_PY_UOS
 #define MICROPY_PY_UOS              (1)