diff --git a/ports/esp32/mpconfigport.h b/ports/esp32/mpconfigport.h
index d60e2823df..a21c0d524d 100644
--- a/ports/esp32/mpconfigport.h
+++ b/ports/esp32/mpconfigport.h
@@ -66,6 +66,7 @@
 #define MICROPY_PY_FUNCTION_ATTRS           (1)
 #define MICROPY_PY_DESCRIPTORS              (1)
 #define MICROPY_PY_DELATTR_SETATTR          (1)
+#define MICROPY_PY_FSTRINGS                 (1)
 #define MICROPY_PY_STR_BYTES_CMP_WARN       (1)
 #define MICROPY_PY_BUILTINS_STR_UNICODE     (1)
 #define MICROPY_PY_BUILTINS_STR_CENTER      (1)
diff --git a/ports/rp2/mpconfigport.h b/ports/rp2/mpconfigport.h
index 218cd72752..ccf11d4f70 100644
--- a/ports/rp2/mpconfigport.h
+++ b/ports/rp2/mpconfigport.h
@@ -74,6 +74,7 @@
 #define MICROPY_PY_FUNCTION_ATTRS               (1)
 #define MICROPY_PY_DESCRIPTORS                  (1)
 #define MICROPY_PY_DELATTR_SETATTR              (1)
+#define MICROPY_PY_FSTRINGS                     (1)
 #define MICROPY_PY_BUILTINS_STR_UNICODE         (1)
 #define MICROPY_PY_BUILTINS_STR_CENTER          (1)
 #define MICROPY_PY_BUILTINS_STR_PARTITION       (1)
diff --git a/ports/stm32/mpconfigport.h b/ports/stm32/mpconfigport.h
index ff58c515e3..7ade406b5b 100644
--- a/ports/stm32/mpconfigport.h
+++ b/ports/stm32/mpconfigport.h
@@ -91,6 +91,9 @@
 #define MICROPY_PY_FUNCTION_ATTRS   (1)
 #define MICROPY_PY_DESCRIPTORS      (1)
 #define MICROPY_PY_DELATTR_SETATTR  (1)
+#ifndef MICROPY_PY_FSTRINGS
+#define MICROPY_PY_FSTRINGS         (1)
+#endif
 #define MICROPY_PY_BUILTINS_STR_UNICODE (1)
 #define MICROPY_PY_BUILTINS_STR_CENTER (1)
 #define MICROPY_PY_BUILTINS_STR_PARTITION (1)