diff --git a/Cargo.toml b/Cargo.toml
index d8eb94e1..fd3ae065 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -116,7 +116,7 @@ chrono = { version = "0.4.26", optional = true, default-features = false, featur
 time = { version = "0.3.25", optional = true, default-features = false, features = [] }
 bigdecimal = { version = "0.4.1", optional = true, default-features = false, features = [] }
 rust_decimal = { version = "1.31.0", optional = true, default-features = false, features = [] }
-indexmap = { version = "2.0.0", optional = true, default-features = false, features = [] }
+indexmap = { version = "2.0.0", optional = true, default-features = false, features = ["std"] }     # TODO: Don't require `std`
 ipnetwork = { version = "0.20.0", optional = true, default-features = false, features = [] }
 mac_address = { version = "1.1.5", optional = true, default-features = false, features = [] }
 bit-vec = { version = "0.6.3", optional = true, default-features = false, features = [] }