diff --git a/src/libcompiler_builtins/Cargo.toml b/src/libcompiler_builtins/Cargo.toml
index 9e91e390a5728..79570dc025219 100644
--- a/src/libcompiler_builtins/Cargo.toml
+++ b/src/libcompiler_builtins/Cargo.toml
@@ -8,6 +8,7 @@ version = "0.0.0"
 name = "compiler_builtins"
 path = "lib.rs"
 test = false
+bench = false
 
 [dependencies]
 core = { path = "../libcore" }
diff --git a/src/libpanic_abort/Cargo.toml b/src/libpanic_abort/Cargo.toml
index 9d62be64fc4ec..d90d2864813c9 100644
--- a/src/libpanic_abort/Cargo.toml
+++ b/src/libpanic_abort/Cargo.toml
@@ -6,6 +6,7 @@ version = "0.0.0"
 [lib]
 path = "lib.rs"
 test = false
+bench = false
 
 [dependencies]
 core = { path = "../libcore" }
diff --git a/src/libpanic_unwind/Cargo.toml b/src/libpanic_unwind/Cargo.toml
index 18f37a8bb174e..90c16fff6f1f1 100644
--- a/src/libpanic_unwind/Cargo.toml
+++ b/src/libpanic_unwind/Cargo.toml
@@ -6,6 +6,7 @@ version = "0.0.0"
 [lib]
 path = "lib.rs"
 test = false
+bench = false
 
 [dependencies]
 alloc = { path = "../liballoc" }
diff --git a/src/librustc_unicode/Cargo.toml b/src/librustc_unicode/Cargo.toml
index 1f4213f0abe40..e2b4afb2a5150 100644
--- a/src/librustc_unicode/Cargo.toml
+++ b/src/librustc_unicode/Cargo.toml
@@ -7,6 +7,7 @@ version = "0.0.0"
 name = "rustc_unicode"
 path = "lib.rs"
 test = false
+bench = false
 
 [dependencies]
 core = { path = "../libcore" }
diff --git a/src/libunwind/Cargo.toml b/src/libunwind/Cargo.toml
index b537c6b1b71c1..36f361b723894 100644
--- a/src/libunwind/Cargo.toml
+++ b/src/libunwind/Cargo.toml
@@ -8,6 +8,7 @@ build = "build.rs"
 name = "unwind"
 path = "lib.rs"
 test = false
+bench = false
 
 [dependencies]
 core = { path = "../libcore" }
diff --git a/src/rustc/libc_shim/Cargo.toml b/src/rustc/libc_shim/Cargo.toml
index 8fc713e0f1bb3..e501766fbed15 100644
--- a/src/rustc/libc_shim/Cargo.toml
+++ b/src/rustc/libc_shim/Cargo.toml
@@ -16,6 +16,7 @@ build = "build.rs"
 name = "libc"
 path = "../../liblibc/src/lib.rs"
 test = false
+bench = false
 
 [dependencies]
 core = { path = "../../libcore" }