export the Demangle function
diff --git a/src/demangle.h b/src/demangle.h
index 9c75915..2653029 100644
--- a/src/demangle.h
+++ b/src/demangle.h
@@ -77,7 +77,7 @@
 // Demangle "mangled".  On success, return true and write the
 // demangled symbol name to "out".  Otherwise, return false.
 // "out" is modified even if demangling is unsuccessful.
-bool Demangle(const char *mangled, char *out, int out_size);
+bool GOOGLE_GLOG_DLL_DECL Demangle(const char *mangled, char *out, int out_size);
 
 _END_GOOGLE_NAMESPACE_