diff --git a/llvm/include/llvm/DebugInfo/DWARF/DWARFUnit.h b/llvm/include/llvm/DebugInfo/DWARF/DWARFUnit.h
--- a/llvm/include/llvm/DebugInfo/DWARF/DWARFUnit.h
+++ b/llvm/include/llvm/DebugInfo/DWARF/DWARFUnit.h
@@ -371,26 +371,6 @@
     return false;
   }
 
-  /// Return the number of bytes for the header of a unit of
-  /// UnitType type.
-  ///
-  /// This function must be called with a valid unit type which in
-  /// DWARF5 is defined as one of the following six types.
-  static uint32_t getDWARF5HeaderSize(uint8_t UnitType) {
-    switch (UnitType) {
-    case dwarf::DW_UT_compile:
-    case dwarf::DW_UT_partial:
-      return 12;
-    case dwarf::DW_UT_skeleton:
-    case dwarf::DW_UT_split_compile:
-      return 20;
-    case dwarf::DW_UT_type:
-    case dwarf::DW_UT_split_type:
-      return 24;
-    }
-    llvm_unreachable("Invalid UnitType.");
-  }
-
   llvm::Optional<object::SectionedAddress> getBaseAddress();
 
   DWARFDie getUnitDIE(bool ExtractUnitDIEOnly = true) {