Index: Common/ErrorHandler.cpp
===================================================================
--- Common/ErrorHandler.cpp
+++ Common/ErrorHandler.cpp
@@ -96,7 +96,7 @@
       std::regex(
           R"(.*\n>>> defined in .*\n>>> referenced by (\S+):(\d+))"),
       std::regex(
-          R"(^undefined (internal|hidden|protected) symbol: .*\n>>> referenced by (\S+):(\d+)\n.*)"),
+          R"(^undefined (?:internal|hidden|protected) symbol: .*\n>>> referenced by (\S+):(\d+)\n.*)"),
       std::regex(R"((\S+):(\d+): unclosed quote)"),
   };
 
Index: test/ELF/vs-diagnostics-undefined-hidden.s
===================================================================
--- /dev/null
+++ test/ELF/vs-diagnostics-undefined-hidden.s
@@ -0,0 +1,42 @@
+// REQUIRES: x86
+// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
+// RUN: not ld.lld --vs-diagnostics -shared %t.o -o %tout 2>&1 \
+// RUN:   | FileCheck %s
+
+// CHECK:      undef.s(15): error: undefined hidden symbol: foo
+// CHECK-NEXT: >>> referenced by undef.s:15
+
+// CHECK:      undef.s(27): error: undefined protected symbol: bar
+// CHECK-NEXT: >>> referenced by undef.s:27
+
+.file 1 "undef.s"
+
+.hidden foo
+.protected bar
+.text
+_start:
+.loc 1 15
+  jmp foo
+.loc 1 27
+  jmp bar
+
+.section .debug_abbrev,"",@progbits
+  .byte  1                      # Abbreviation Code
+  .byte 17                      # DW_TAG_compile_unit
+  .byte  0                      # DW_CHILDREN_no
+  .byte 16                      # DW_AT_stmt_list
+  .byte 23                      # DW_FORM_sec_offset
+  .byte  0                      # EOM(1)
+  .byte  0                      # EOM(2)
+  .byte  0                      # EOM(3)
+
+.section .debug_info,"",@progbits
+  .long .Lend0 - .Lbegin0       # Length of Unit
+.Lbegin0:
+  .short 4                      # DWARF version number
+  .long  .debug_abbrev          # Offset Into Abbrev. Section
+  .byte  8                      # Address Size (in bytes)
+  .byte  1                      # Abbrev [1] 0xb:0x1f DW_TAG_compile_unit
+  .long  .debug_line            # DW_AT_stmt_list
+.Lend0:
+  .section .debug_line,"",@progbits