diff --git a/llvm/lib/Bitcode/Writer/Serialize.cpp b/llvm/lib/Bitcode/Writer/Serialize.cpp
index a1d7320..58baf10 100644
--- a/llvm/lib/Bitcode/Writer/Serialize.cpp
+++ b/llvm/lib/Bitcode/Writer/Serialize.cpp
@@ -57,7 +57,7 @@
   EmitCStr(s,s+strlen(s));
 }
 
-unsigned Serializer::getPtrId(void* ptr) {
+unsigned Serializer::getPtrId(const void* ptr) {
   if (!ptr)
     return 0;