diff --git a/llvm/lib/Analysis/DataStructure/Printer.cpp b/llvm/lib/Analysis/DataStructure/Printer.cpp
index 4d5fa81..ee143f6 100644
--- a/llvm/lib/Analysis/DataStructure/Printer.cpp
+++ b/llvm/lib/Analysis/DataStructure/Printer.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Analysis/DataStructure/DataStructure.h"
+#include "llvm/Analysis/DataStructure/EquivClassGraphs.h"
 #include "llvm/Analysis/DataStructure/DSGraph.h"
 #include "llvm/Analysis/DataStructure/DSGraphTraits.h"
 #include "llvm/Module.h"
@@ -333,3 +334,8 @@
 }
 
 
+void EquivClassGraphs::print(std::ostream &O, const Module *M) const {
+  if (DontPrintAnything) return;
+  printCollection(*this, O, M, "eq.");
+}
+