diff --git a/include/llvm/Transforms/Utils/IntegerDivision.h b/include/llvm/Transforms/Utils/IntegerDivision.h
index 531ef139dc5..a8008ee066d 100644
--- a/include/llvm/Transforms/Utils/IntegerDivision.h
+++ b/include/llvm/Transforms/Utils/IntegerDivision.h
@@ -17,6 +17,10 @@
 #ifndef TRANSFORMS_UTILS_INTEGERDIVISION_H
 #define TRANSFORMS_UTILS_INTEGERDIVISION_H
 
+namespace llvm {
+  class BinaryOperator;
+}
+
 namespace llvm {
 
   bool expandDivision(BinaryOperator* Div);