diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/lldbvscode_testcase.py
@@ -251,7 +251,7 @@
                initCommands=None, preRunCommands=None, stopCommands=None,
                exitCommands=None, attachCommands=None, coreFile=None,
                disconnectAutomatically=True, terminateCommands=None,
-               postRunCommands=None):
+               postRunCommands=None, sourceMap=None):
         '''Build the default Makefile target, create the VSCode debug adaptor,
            and attach to the process.
         '''
@@ -271,7 +271,8 @@
             initCommands=initCommands, preRunCommands=preRunCommands,
             stopCommands=stopCommands, exitCommands=exitCommands,
             attachCommands=attachCommands, terminateCommands=terminateCommands,
-            coreFile=coreFile, postRunCommands=postRunCommands)
+            coreFile=coreFile, postRunCommands=postRunCommands,
+            sourceMap=sourceMap)
         if not (response and response['success']):
             self.assertTrue(response['success'],
                             'attach failed (%s)' % (response['message']))
diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py
@@ -506,7 +506,8 @@
                        initCommands=None, preRunCommands=None,
                        stopCommands=None, exitCommands=None,
                        attachCommands=None, terminateCommands=None,
-                       coreFile=None, postRunCommands=None):
+                       coreFile=None, postRunCommands=None,
+                       sourceMap=None):
         args_dict = {}
         if pid is not None:
             args_dict['pid'] = pid
@@ -533,6 +534,8 @@
             args_dict['coreFile'] = coreFile
         if postRunCommands:
             args_dict['postRunCommands'] = postRunCommands
+        if sourceMap:
+            args_dict['sourceMap'] = sourceMap
         command_dict = {
             'command': 'attach',
             'type': 'request',
diff --git a/lldb/test/API/tools/lldb-vscode/coreFile/TestVSCode_coreFile.py b/lldb/test/API/tools/lldb-vscode/coreFile/TestVSCode_coreFile.py
--- a/lldb/test/API/tools/lldb-vscode/coreFile/TestVSCode_coreFile.py
+++ b/lldb/test/API/tools/lldb-vscode/coreFile/TestVSCode_coreFile.py
@@ -41,3 +41,18 @@
 
         self.vscode.request_next(threadId=32259)
         self.assertEquals(self.get_stackFrames(), expected_frames)
+
+    @skipIfWindows
+    @skipIfRemote
+    def test_core_file_source_mapping(self):
+        ''' Test that sourceMap property is correctly applied when loading a core '''
+        current_dir = os.path.dirname(os.path.realpath(__file__))
+        exe_file = os.path.join(current_dir, "linux-x86_64.out")
+        core_file = os.path.join(current_dir, "linux-x86_64.core")
+
+        self.create_debug_adaptor()
+
+        source_map = [["/home/labath/test", current_dir]]
+        self.attach(exe_file, coreFile=core_file, sourceMap=source_map)
+
+        self.assertTrue(current_dir in self.get_stackFrames()[0]['source']['path'])
diff --git a/lldb/test/API/tools/lldb-vscode/coreFile/main.c b/lldb/test/API/tools/lldb-vscode/coreFile/main.c
new file mode 100644
--- /dev/null
+++ b/lldb/test/API/tools/lldb-vscode/coreFile/main.c
@@ -0,0 +1 @@
+/* Fake source file for core dump source mapping test */
diff --git a/lldb/tools/lldb-vscode/lldb-vscode.cpp b/lldb/tools/lldb-vscode/lldb-vscode.cpp
--- a/lldb/tools/lldb-vscode/lldb-vscode.cpp
+++ b/lldb/tools/lldb-vscode/lldb-vscode.cpp
@@ -616,6 +616,8 @@
   // Run any initialize LLDB commands the user specified in the launch.json
   g_vsc.RunInitCommands();
 
+  SetSourceMapFromArguments(*arguments);
+
   lldb::SBError status;
   g_vsc.SetTarget(g_vsc.CreateTargetFromArguments(*arguments, status));
   if (status.Fail()) {
@@ -657,8 +659,6 @@
     g_vsc.target = g_vsc.debugger.GetSelectedTarget();
   }
 
-  SetSourceMapFromArguments(*arguments);
-
   if (error.Success() && core_file.empty()) {
     auto attached_pid = g_vsc.target.GetProcess().GetProcessID();
     if (attached_pid == LLDB_INVALID_PROCESS_ID) {