Index: lib/sanitizer_common/sanitizer_flag_parser.h
===================================================================
--- lib/sanitizer_common/sanitizer_flag_parser.h
+++ lib/sanitizer_common/sanitizer_flag_parser.h
@@ -22,6 +22,7 @@
 
 class FlagHandlerBase {
  public:
+  virtual ~FlagHandlerBase();
   virtual bool Parse(const char *value) { return false; }
 };
 
Index: lib/sanitizer_common/sanitizer_flag_parser.cc
===================================================================
--- lib/sanitizer_common/sanitizer_flag_parser.cc
+++ lib/sanitizer_common/sanitizer_flag_parser.cc
@@ -20,6 +20,8 @@
 
 namespace __sanitizer {
 
+FlagHandlerBase::~FlagHandlerBase() {}
+
 LowLevelAllocator FlagParser::Alloc;
 
 class UnknownFlags {