diff --git a/src/common/dwarf_cu_to_module.cc b/src/common/dwarf_cu_to_module.cc
index abcf36f8..1f1a1743 100644
--- a/src/common/dwarf_cu_to_module.cc
+++ b/src/common/dwarf_cu_to_module.cc
@@ -526,7 +526,7 @@ bool DwarfCUToModule::NamedScopeHandler::EndAttributes() {
 dwarf2reader::DIEHandler *DwarfCUToModule::NamedScopeHandler::FindChildHandler(
     uint64 offset,
     enum DwarfTag tag,
-    const AttributeList &attrs) {
+    const AttributeList &/*attrs*/) {
   switch (tag) {
     case dwarf2reader::DW_TAG_subprogram:
       return new FuncHandler(cu_context_, &child_context_, offset);
@@ -668,7 +668,7 @@ bool DwarfCUToModule::EndAttributes() {
 dwarf2reader::DIEHandler *DwarfCUToModule::FindChildHandler(
     uint64 offset,
     enum DwarfTag tag,
-    const AttributeList &attrs) {
+    const AttributeList &/*attrs*/) {
   switch (tag) {
     case dwarf2reader::DW_TAG_subprogram:
       return new FuncHandler(cu_context_, child_context_, offset);
@@ -979,7 +979,7 @@ bool DwarfCUToModule::StartCompilationUnit(uint64 offset,
 }
 
 bool DwarfCUToModule::StartRootDIE(uint64 offset, enum DwarfTag tag,
-                                   const AttributeList& attrs) {
+                                   const AttributeList& /*attrs*/) {
   // We don't deal with partial compilation units (the only other tag
   // likely to be used for root DIE).
   return tag == dwarf2reader::DW_TAG_compile_unit;