diff --git a/afl/Cargo.toml b/afl/Cargo.toml
index d0b023a8e8..328552e0bc 100644
--- a/afl/Cargo.toml
+++ b/afl/Cargo.toml
@@ -39,3 +39,4 @@ xxhash-rust = { version = "0.8.0", features = ["xxh3"] } # xxh3 hashing for rust
 serde = { version = "1.0", default-features = false, features = ["alloc"] } # serialization lib
 erased-serde = "0.3.12"
 postcard = { version = "0.5.1", features = ["alloc"] } # no_std compatible serde serialization fromat
+static_assertions = "1.1.0"
diff --git a/afl/src/lib.rs b/afl/src/lib.rs
index 0571ff0bde..7597b4c746 100644
--- a/afl/src/lib.rs
+++ b/afl/src/lib.rs
@@ -7,6 +7,9 @@ Welcome to libAFL
 #[macro_use]
 extern crate alloc;
 
+#[macro_use]
+extern crate static_assertions;
+
 pub mod corpus;
 pub mod engines;
 pub mod events;
diff --git a/afl/src/serde_anymap.rs b/afl/src/serde_anymap.rs
index 94062b567d..4cab18cb85 100644
--- a/afl/src/serde_anymap.rs
+++ b/afl/src/serde_anymap.rs
@@ -7,10 +7,12 @@ use core::any::{Any, TypeId};
 // yolo
 
 pub fn pack_type_id(id: u64) -> TypeId {
+    assert_eq_size!(TypeId, u64);
     unsafe { *(&id as *const u64 as *const TypeId) }
 }
 
 pub fn unpack_type_id(id: TypeId) -> u64 {
+    assert_eq_size!(TypeId, u64);
     unsafe { *(&id as *const _ as *const u64) }
 }