diff --git a/llvm/include/llvm/TargetParser/Triple.h b/llvm/include/llvm/TargetParser/Triple.h
index 3a1a962003abf..aa82a312a0ca2 100644
--- a/llvm/include/llvm/TargetParser/Triple.h
+++ b/llvm/include/llvm/TargetParser/Triple.h
@@ -270,6 +270,8 @@ class Triple {
     MuslX32,
     LLVM,
 
+    CheriPureCap,
+
     MSVC,
     Itanium,
     Cygnus,
diff --git a/llvm/lib/TargetParser/Triple.cpp b/llvm/lib/TargetParser/Triple.cpp
index faabaf18d8071..013b8ae072474 100644
--- a/llvm/lib/TargetParser/Triple.cpp
+++ b/llvm/lib/TargetParser/Triple.cpp
@@ -362,6 +362,8 @@ StringRef Triple::getEnvironmentTypeName(EnvironmentType Kind) {
     return "pauthtest";
   case LLVM:
     return "llvm";
+  case CheriPureCap:
+    return "purecap";
   }
 
   llvm_unreachable("Invalid EnvironmentType!");
@@ -743,6 +745,7 @@ static Triple::EnvironmentType parseEnvironment(StringRef EnvironmentName) {
       .StartsWith("ohos", Triple::OpenHOS)
       .StartsWith("pauthtest", Triple::PAuthTest)
       .StartsWith("llvm", Triple::LLVM)
+      .StartsWith("purecap", Triple::CheriPureCap)
       .Default(Triple::UnknownEnvironment);
 }
 
diff --git a/llvm/unittests/TargetParser/TripleTest.cpp b/llvm/unittests/TargetParser/TripleTest.cpp
index 87f9083fa344c..10fff4e2a96d8 100644
--- a/llvm/unittests/TargetParser/TripleTest.cpp
+++ b/llvm/unittests/TargetParser/TripleTest.cpp
@@ -1347,6 +1347,12 @@ TEST(TripleTest, ParsedIDs) {
   EXPECT_EQ(Triple::Linux, T.getOS());
   EXPECT_EQ(Triple::LLVM, T.getEnvironment());
 
+  T = Triple("riscv64-unknown-linux-purecap");
+  EXPECT_EQ(Triple::riscv64, T.getArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+  EXPECT_EQ(Triple::CheriPureCap, T.getEnvironment());
+
   T = Triple("huh");
   EXPECT_EQ(Triple::UnknownArch, T.getArch());
 }