diff --git a/core/embed/rust/build.rs b/core/embed/rust/build.rs
index add740f9d..fef21544e 100644
--- a/core/embed/rust/build.rs
+++ b/core/embed/rust/build.rs
@@ -97,8 +97,6 @@ fn generate_micropython_bindings() {
         // exceptions
         .allowlist_function("nlr_jump")
         .allowlist_function("mp_obj_new_exception")
-        .allowlist_function("mp_obj_new_exception_msg")
-        .allowlist_function("mp_obj_new_exception_arg1")
         .allowlist_function("mp_obj_new_exception_args")
         .allowlist_function("trezor_obj_call_protected")
         .allowlist_var("mp_type_AttributeError")
diff --git a/core/embed/rust/src/error.rs b/core/embed/rust/src/error.rs
index ba6af4c47..7ad5a8aca 100644
--- a/core/embed/rust/src/error.rs
+++ b/core/embed/rust/src/error.rs
@@ -34,10 +34,14 @@ impl Error {
                 Error::AllocationFailed => ffi::mp_obj_new_exception(&ffi::mp_type_MemoryError),
                 Error::CaughtException(obj) => obj,
                 Error::KeyError(key) => {
-                    ffi::mp_obj_new_exception_arg1(&ffi::mp_type_KeyError, key.into())
+                    ffi::mp_obj_new_exception_args(&ffi::mp_type_KeyError, 1, &key.into())
                 }
                 Error::ValueError(msg) => {
-                    ffi::mp_obj_new_exception_msg(&ffi::mp_type_ValueError, msg.as_ptr())
+                    if let Ok(msg) = msg.try_into() {
+                        ffi::mp_obj_new_exception_args(&ffi::mp_type_ValueError, 1, &msg)
+                    } else {
+                        ffi::mp_obj_new_exception(&ffi::mp_type_ValueError)
+                    }
                 }
                 Error::ValueErrorParam(msg, param) => {
                     if let Ok(msg) = msg.try_into() {
@@ -48,7 +52,7 @@ impl Error {
                     }
                 }
                 Error::AttributeError(attr) => {
-                    ffi::mp_obj_new_exception_arg1(&ffi::mp_type_AttributeError, attr.into())
+                    ffi::mp_obj_new_exception_args(&ffi::mp_type_AttributeError, 1, &attr.into())
                 }
             }
         }