diff --git a/compiler/rustc_target/src/spec/x86_64_pc_solaris.rs b/compiler/rustc_target/src/spec/x86_64_pc_solaris.rs
index cb62a8173222e..d2906d6c4ae99 100644
--- a/compiler/rustc_target/src/spec/x86_64_pc_solaris.rs
+++ b/compiler/rustc_target/src/spec/x86_64_pc_solaris.rs
@@ -7,7 +7,7 @@ pub fn target() -> Target {
     base.vendor = "pc".into();
     base.max_atomic_width = Some(64);
     base.stack_probes = StackProbeType::X86;
-    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI;
+    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::THREAD;
 
     Target {
         llvm_target: "x86_64-pc-solaris".into(),
diff --git a/compiler/rustc_target/src/spec/x86_64_unknown_illumos.rs b/compiler/rustc_target/src/spec/x86_64_unknown_illumos.rs
index 04a12a7bfa642..ca5b62e279c1c 100644
--- a/compiler/rustc_target/src/spec/x86_64_unknown_illumos.rs
+++ b/compiler/rustc_target/src/spec/x86_64_unknown_illumos.rs
@@ -5,7 +5,7 @@ pub fn target() -> Target {
     base.add_pre_link_args(LinkerFlavor::Unix(Cc::Yes), &["-m64", "-std=c99"]);
     base.cpu = "x86-64".into();
     base.max_atomic_width = Some(64);
-    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI;
+    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::THREAD;
 
     Target {
         // LLVM does not currently have a separate illumos target,