Error: Unresolved import 'self::inner'

[HakonToemte]

Hey
I'm trying to add the third party crate chrono to my TA.
After adding chrono = "0.4.22" to my TA Cargo.toml, running "make" inside my example returns this error:

I know it's related to the chrono crate because the example compiles fine when i remove chrono from the toml.
Adding chrono to the CA also compiles fine.

My .toml dependencies looks like this:

[dependencies]
chrono = "0.4.22"
libc = { path = "../../../rust/libc" }
proto = { path = "../proto" }
optee-utee-sys = { path = "../../../optee-utee/optee-utee-sys" }
optee-utee = { path = "../../../optee-utee" }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"

Any idea what could be the source of this?
Thanks again :)