diff --git a/unittests/ExecutionEngine/MCJIT/MCJITCAPITest.cpp b/unittests/ExecutionEngine/MCJIT/MCJITCAPITest.cpp
index 092213277d1..3813d59dbd1 100644
--- a/unittests/ExecutionEngine/MCJIT/MCJITCAPITest.cpp
+++ b/unittests/ExecutionEngine/MCJIT/MCJITCAPITest.cpp
@@ -135,6 +135,8 @@ protected:
     // The operating systems below are known to be sufficiently incompatible
     // that they will fail the MCJIT C API tests.
     UnsupportedOSs.push_back(Triple::Cygwin);
+
+    UnsupportedEnvironments.push_back(Triple::Cygnus);
   }
   
   virtual void SetUp() {
diff --git a/unittests/ExecutionEngine/MCJIT/MCJITTestAPICommon.h b/unittests/ExecutionEngine/MCJIT/MCJITTestAPICommon.h
index 7b6e39fb238..a48c0713f9b 100644
--- a/unittests/ExecutionEngine/MCJIT/MCJITTestAPICommon.h
+++ b/unittests/ExecutionEngine/MCJIT/MCJITTestAPICommon.h
@@ -71,10 +71,15 @@ protected:
   /// Returns true if the host OS is known to support MCJIT
   bool OSSupportsMCJIT() {
     Triple Host(HostTriple);
+
+    if (std::find(UnsupportedEnvironments.begin(), UnsupportedEnvironments.end(),
+                  Host.getEnvironment()) != UnsupportedEnvironments.end())
+      return false;
+
     if (std::find(UnsupportedOSs.begin(), UnsupportedOSs.end(), Host.getOS())
-        == UnsupportedOSs.end()) {
+        == UnsupportedOSs.end())
       return true;
-    }
+
     return false;
   }
 
@@ -83,6 +88,7 @@ protected:
   SmallVector<Triple::ArchType, 1> HasSubArchs;
   SmallVector<std::string, 2> SupportedSubArchs; // We need to own the memory
   SmallVector<Triple::OSType, 4> UnsupportedOSs;
+  SmallVector<Triple::EnvironmentType, 1> UnsupportedEnvironments;
 };
 
 } // namespace llvm
diff --git a/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h b/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h
index b2cb3bbef6e..25de312e0e8 100644
--- a/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h
+++ b/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h
@@ -304,6 +304,8 @@ protected:
     // should be kept in sync.
     UnsupportedOSs.push_back(Triple::Cygwin);
     UnsupportedOSs.push_back(Triple::Darwin);
+
+    UnsupportedEnvironments.push_back(Triple::Cygnus);
   }
 
   void createJIT(Module *M) {