diff --git a/llvm/test/ObjectYAML/MachO/DWARF-debug_line.yaml b/llvm/test/ObjectYAML/MachO/DWARF-debug_line.yaml
--- a/llvm/test/ObjectYAML/MachO/DWARF-debug_line.yaml
+++ b/llvm/test/ObjectYAML/MachO/DWARF-debug_line.yaml
@@ -557,21 +557,21 @@
 #CHECK:           SubOpcode:       DW_LNE_set_address
 #CHECK:           Data:            4294971216
 #CHECK:         - Opcode:          0x14
-#CHECK:           Data:            4294971216
+#CHECK:           Data:            0
 #CHECK:         - Opcode:          DW_LNS_set_column
 #CHECK:           Data:            3
 #CHECK:         - Opcode:          DW_LNS_set_prologue_end
-#CHECK:           Data:            3
+#CHECK:           Data:            0
 #CHECK:         - Opcode:          DW_LNS_const_add_pc
-#CHECK:           Data:            3
+#CHECK:           Data:            0
 #CHECK:         - Opcode:          0xBB
-#CHECK:           Data:            3
+#CHECK:           Data:            0
 #CHECK:         - Opcode:          0xBB
-#CHECK:           Data:            3
+#CHECK:           Data:            0
 #CHECK:         - Opcode:          DW_LNS_advance_pc
 #CHECK:           Data:            11
 #CHECK:         - Opcode:          DW_LNS_extended_op
 #CHECK:           ExtLen:          1
 #CHECK:           SubOpcode:       DW_LNE_end_sequence
-#CHECK:           Data:            11
+#CHECK:           Data:            0
 #CHECK: ...
diff --git a/llvm/tools/obj2yaml/dwarf2yaml.cpp b/llvm/tools/obj2yaml/dwarf2yaml.cpp
--- a/llvm/tools/obj2yaml/dwarf2yaml.cpp
+++ b/llvm/tools/obj2yaml/dwarf2yaml.cpp
@@ -287,7 +287,7 @@
       const uint64_t LineEnd =
           LineTableLength + *StmtOffset + SizeOfPrologueLength;
       while (Offset < LineEnd) {
-        DWARFYAML::LineTableOpcode NewOp;
+        DWARFYAML::LineTableOpcode NewOp = {};
         NewOp.Opcode = (dwarf::LineNumberOps)LineData.getU8(&Offset);
         if (NewOp.Opcode == 0) {
           auto StartExt = Offset;