diff --git a/ports/geckolib/Cargo.toml b/ports/geckolib/Cargo.toml
index a9a853b4d41..bd2b0406f9b 100644
--- a/ports/geckolib/Cargo.toml
+++ b/ports/geckolib/Cargo.toml
@@ -19,9 +19,9 @@ lazy_static = "0.1"
 libc = "0.2"
 log = "0.3"
 num_cpus = "0.2.2"
-selectors = {version = "0.5", features = ["heap_size"]}
+selectors = {version = "0.5", features = ["heap_size", "unstable"]}
 smallvec = "0.1"
-string_cache = {version = "0.2.10", features = ["heap_size"]}
+string_cache = {version = "0.2.10", features = ["heap_size", "unstable"]}
 url = {version = "0.5.5", features = ["heap_size"]}
 
 [dependencies.plugins]