diff --git a/Cargo.lock b/Cargo.lock
index 243a326646c3..e0b0640178b0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3129,11 +3129,7 @@ dependencies = [
 name = "rustc_codegen_llvm"
 version = "0.0.0"
 dependencies = [
- "cc",
- "memmap",
- "num_cpus",
  "rustc_llvm",
- "tempfile",
 ]
 
 [[package]]
diff --git a/src/librustc_codegen_llvm/Cargo.toml b/src/librustc_codegen_llvm/Cargo.toml
index 5e1b0eafdec3..98efa6a5804b 100644
--- a/src/librustc_codegen_llvm/Cargo.toml
+++ b/src/librustc_codegen_llvm/Cargo.toml
@@ -11,11 +11,7 @@ crate-type = ["dylib"]
 test = false
 
 [dependencies]
-cc = "1.0.1" # Used to locate MSVC
-num_cpus = "1.0"
-tempfile = "3.0"
 rustc_llvm = { path = "../librustc_llvm" }
-memmap = "0.6"
 
 [features]
 # This is used to convince Cargo to separately cache builds of `rustc_codegen_llvm`