diff --git a/Source/cmExecuteProcessCommand.cxx b/Source/cmExecuteProcessCommand.cxx
index 2c04d604ef..b24a016eb4 100644
--- a/Source/cmExecuteProcessCommand.cxx
+++ b/Source/cmExecuteProcessCommand.cxx
@@ -377,8 +377,7 @@ bool cmExecuteProcessCommand(std::vector<std::string> const& args,
     outputData.Finished = true;
   }
   std::unique_ptr<cmUVStreamReadHandle> errorHandle;
-  if (chain.ErrorStream() >= 0 &&
-      chain.ErrorStream() != chain.OutputStream()) {
+  if (chain.ErrorStream() >= 0) {
     errorData.Stream.init(chain.GetLoop(), 0);
     uv_pipe_open(errorData.Stream, chain.ErrorStream());
     errorHandle = cmUVStreamRead(
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index f00c440c41..6390630eee 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -954,7 +954,7 @@ bool cmSystemTools::RunSingleCommand(std::vector<std::string> const& command,
     outputHandle =
       startRead(outStream, chain.OutputStream(), captureStdOut, tempStdOut, 1,
                 cmSystemTools::Stdout, outFinished);
-    if (chain.OutputStream() != chain.ErrorStream()) {
+    if (chain.ErrorStream() >= 0) {
       errorHandle =
         startRead(errStream, chain.ErrorStream(), captureStdErr, tempStdErr, 2,
                   cmSystemTools::Stderr, errFinished);
diff --git a/Source/cmUVProcessChain.cxx b/Source/cmUVProcessChain.cxx
index d0e97ed253..a390c56663 100644
--- a/Source/cmUVProcessChain.cxx
+++ b/Source/cmUVProcessChain.cxx
@@ -261,7 +261,6 @@ bool cmUVProcessChain::InternalData::Prepare(
 
     case cmUVProcessChainBuilder::Builtin: {
       if (this->Builder->MergedBuiltinStreams) {
-        errorData.BuiltinStream = outputData.BuiltinStream;
         errorData.Stdio.flags = UV_INHERIT_FD;
         errorData.Stdio.data.fd = outputData.Stdio.data.fd;
       } else {
diff --git a/Tests/CMakeLib/testUVProcessChain.cxx b/Tests/CMakeLib/testUVProcessChain.cxx
index 8ac16b21e2..c275158d76 100644
--- a/Tests/CMakeLib/testUVProcessChain.cxx
+++ b/Tests/CMakeLib/testUVProcessChain.cxx
@@ -342,13 +342,8 @@ bool testUVProcessChainBuiltinMerged(char const* helperCommand)
     std::cout << "OutputStream() was invalid, expecting valid" << std::endl;
     return false;
   }
-  if (chain->ErrorStream() < 0) {
-    std::cout << "ErrorStream() was invalid, expecting valid" << std::endl;
-    return false;
-  }
-  if (chain->OutputStream() != chain->ErrorStream()) {
-    std::cout << "OutputStream() and ErrorStream() expected to be the same"
-              << std::endl;
+  if (chain->ErrorStream() >= 0) {
+    std::cout << "ErrorStream() was valid, expecting invalid" << std::endl;
     return false;
   }