diff --git a/machine/Cargo.toml b/machine/Cargo.toml
index 01c979c..44f1a95 100644
--- a/machine/Cargo.toml
+++ b/machine/Cargo.toml
@@ -36,7 +36,7 @@ usize_conversions = "0.2"
 bit_field = "0.10"
 bitflags = "1.3"
 cfg-if = "1.0"
-snafu = { version = "0.7", default-features = false }
+snafu = { version = "0.7", default-features = false, features = ["unstable-core-error"] }
 buddy-alloc = { git = "https://github.com/metta-systems/buddy-alloc", version = "0.6.0", branch = "feature/allocator-api" }
 once_cell = { version = "1.18", default-features = false, features = ["unstable"] }
 
diff --git a/nucleus/Cargo.toml b/nucleus/Cargo.toml
index 8f01719..feb6665 100644
--- a/nucleus/Cargo.toml
+++ b/nucleus/Cargo.toml
@@ -35,7 +35,7 @@ usize_conversions = "0.2"
 bit_field = "0.10"
 bitflags = "1.3"
 cfg-if = "1.0"
-snafu = { version = "0.7", default-features = false }
+snafu = { version = "0.7", default-features = false, features = ["unstable-core-error"] }
 
 [[bin]]
 name = "nucleus"