diff --git a/src/common/cmdline.cpp b/src/common/cmdline.cpp
index 95afbfe27f..ce169ac95b 100644
--- a/src/common/cmdline.cpp
+++ b/src/common/cmdline.cpp
@@ -1332,7 +1332,7 @@ wxCmdLineParser::ConvertStringToArgs(const wxString& cmdline,
                     break;
                 }
 
-                lastBS = ch == '\\';
+                lastBS = !lastBS && ch == '\\';
             }
             else // type == wxCMD_LINE_SPLIT_UNIX
             {
diff --git a/tests/cmdline/cmdlinetest.cpp b/tests/cmdline/cmdlinetest.cpp
index e27bcccbba..04e5c2ac83 100644
--- a/tests/cmdline/cmdlinetest.cpp
+++ b/tests/cmdline/cmdlinetest.cpp
@@ -96,6 +96,7 @@ void CmdLineTestCase::ConvertStringTestCase()
     WX_ASSERT_ARGS_EQUAL( "1|2 3|4", "1 \"2 3\" 4" );
 
     // check for (broken) Windows semantics: backslash doesn't escape spaces
+    WX_ASSERT_DOS_ARGS_EQUAL( "\\\\foo\\\\|/bar", "\"\\\\foo\\\\\" /bar" );
     WX_ASSERT_DOS_ARGS_EQUAL( "foo|bar\\|baz", "foo bar\\ baz" );
     WX_ASSERT_DOS_ARGS_EQUAL( "foo|bar\\\"baz", "foo \"bar\\\"baz\"" );