diff --git a/core/embed/firmware/mpconfigport.h b/core/embed/firmware/mpconfigport.h
index 3c31749fe..10cf234c7 100644
--- a/core/embed/firmware/mpconfigport.h
+++ b/core/embed/firmware/mpconfigport.h
@@ -123,6 +123,7 @@
 #define MICROPY_PY_SYS_PLATFORM     "trezor"
 #define MICROPY_PY_UERRNO           (0)
 #define MICROPY_PY_THREAD           (0)
+#define MICROPY_PY_FSTRINGS         (1)
 
 // extended modules
 #define MICROPY_PY_UCTYPES          (1)
diff --git a/core/embed/unix/mpconfigport.h b/core/embed/unix/mpconfigport.h
index f208aa88e..8651c83bd 100644
--- a/core/embed/unix/mpconfigport.h
+++ b/core/embed/unix/mpconfigport.h
@@ -131,6 +131,7 @@
 #define MICROPY_PY_SYS_PLATFORM     "trezor-emulator"
 #define MICROPY_PY_UERRNO           (0)
 #define MICROPY_PY_THREAD           (0)
+#define MICROPY_PY_FSTRINGS         (1)
 
 // extended modules
 #define MICROPY_PY_UCTYPES          (1)