diff --git a/src/librustc_asan/Cargo.toml b/src/librustc_asan/Cargo.toml
index 2d4872b1fc9..0fda2805fea 100644
--- a/src/librustc_asan/Cargo.toml
+++ b/src/librustc_asan/Cargo.toml
@@ -7,6 +7,7 @@ version = "0.0.0"
 [lib]
 name = "rustc_asan"
 path = "lib.rs"
+test = false
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
diff --git a/src/librustc_lsan/Cargo.toml b/src/librustc_lsan/Cargo.toml
index bc1f2ead768..786883d2135 100644
--- a/src/librustc_lsan/Cargo.toml
+++ b/src/librustc_lsan/Cargo.toml
@@ -7,6 +7,7 @@ version = "0.0.0"
 [lib]
 name = "rustc_lsan"
 path = "lib.rs"
+test = false
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
diff --git a/src/librustc_msan/Cargo.toml b/src/librustc_msan/Cargo.toml
index 45cc6b9839f..b3b70bc0a25 100644
--- a/src/librustc_msan/Cargo.toml
+++ b/src/librustc_msan/Cargo.toml
@@ -7,6 +7,7 @@ version = "0.0.0"
 [lib]
 name = "rustc_msan"
 path = "lib.rs"
+test = false
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
diff --git a/src/librustc_tsan/Cargo.toml b/src/librustc_tsan/Cargo.toml
index 66d6236361e..97c1181e3a2 100644
--- a/src/librustc_tsan/Cargo.toml
+++ b/src/librustc_tsan/Cargo.toml
@@ -7,6 +7,7 @@ version = "0.0.0"
 [lib]
 name = "rustc_tsan"
 path = "lib.rs"
+test = false
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }