diff --git a/llvm/lib/System/DynamicLibrary.cpp b/llvm/lib/System/DynamicLibrary.cpp
index 435513d..859092a 100644
--- a/llvm/lib/System/DynamicLibrary.cpp
+++ b/llvm/lib/System/DynamicLibrary.cpp
@@ -173,3 +173,5 @@
 }
 
 #endif // LLVM_ON_WIN32
+
+DEFINING_FILE_FOR(SystemDynamicLibrary)