diff --git a/src/common/linux/dump_symbols.cc b/src/common/linux/dump_symbols.cc
index a7888189..5d4e8834 100644
--- a/src/common/linux/dump_symbols.cc
+++ b/src/common/linux/dump_symbols.cc
@@ -144,6 +144,7 @@ class DumpStabsHandler: public google_breakpad::StabsHandler {
   bool StartFunction(const std::string &name, uint64_t address);
   bool EndFunction(uint64_t address);
   bool Line(uint64_t address, const char *name, int number);
+  void Warning(const char *format, ...);
 
   // Do any final processing necessary to make module_ contain all the
   // data provided by the STABS reader.
@@ -265,6 +266,13 @@ bool DumpStabsHandler::Line(uint64_t address, const char *name, int number) {
   return true;
 }
 
+void DumpStabsHandler::Warning(const char *format, ...) {
+  va_list args;
+  va_start(args, format);
+  vfprintf(stderr, format, args);
+  va_end(args);
+}
+
 void DumpStabsHandler::Finalize() {
   // Sort our boundary list, so we can search it quickly.
   sort(boundaries_.begin(), boundaries_.end());
diff --git a/src/common/linux/stabs_reader.h b/src/common/linux/stabs_reader.h
index 7ebc30b1..1f284b02 100644
--- a/src/common/linux/stabs_reader.h
+++ b/src/common/linux/stabs_reader.h
@@ -180,7 +180,7 @@ class StabsHandler {
 
   // Report a warning.  FORMAT is a printf-like format string,
   // specifying how to format the subsequent arguments.
-  virtual void Warning(const char *format, ...) { }
+  virtual void Warning(const char *format, ...) = 0;
 };
 
 } // namespace google_breakpad