diff --git a/lldb/lit/Process/Inputs/env.cpp b/lldb/lit/Process/Inputs/env.cpp
new file mode 100644
index 0000000000000..cbf671ccd2f50
--- /dev/null
+++ b/lldb/lit/Process/Inputs/env.cpp
@@ -0,0 +1,7 @@
+#include <cstdlib>
+#include <iostream>
+
+int main() {
+  if (const char *env_p = std::getenv("FOO"))
+    std::cout << "FOO=" << env_p << '\n';
+}
diff --git a/lldb/lit/Process/TestEnvironment.test b/lldb/lit/Process/TestEnvironment.test
new file mode 100644
index 0000000000000..8bbf8767f33fa
--- /dev/null
+++ b/lldb/lit/Process/TestEnvironment.test
@@ -0,0 +1,7 @@
+The double quotes around "BAR" ensure we don't match the command.
+
+RUN: %clangxx -std=c++11 %p/Inputs/env.cpp -o %t
+RUN: %lldb %t -o 'process launch --environment FOO="BAR"' | FileCheck %s
+RUN: %lldb %t -o 'env FOO="BAR"' -o 'process launch' | FileCheck %s
+
+CHECK: FOO=BAR
diff --git a/lldb/source/Commands/CommandObjectProcess.cpp b/lldb/source/Commands/CommandObjectProcess.cpp
index 1cc0b0b43c78a..b20a2d5333327 100644
--- a/lldb/source/Commands/CommandObjectProcess.cpp
+++ b/lldb/source/Commands/CommandObjectProcess.cpp
@@ -193,7 +193,10 @@ class CommandObjectProcessLaunch : public CommandObjectProcessLaunchOrAttach {
     if (target->GetDisableSTDIO())
       m_options.launch_info.GetFlags().Set(eLaunchFlagDisableSTDIO);
 
-    m_options.launch_info.GetEnvironment() = target->GetEnvironment();
+    // Merge the launch info environment with the target environment.
+    Environment target_env = target->GetEnvironment();
+    m_options.launch_info.GetEnvironment().insert(target_env.begin(),
+                                                  target_env.end());
 
     if (!target_settings_argv0.empty()) {
       m_options.launch_info.GetArguments().AppendArgument(