diff --git a/src/rustllvm/rustllvm.def.in b/src/rustllvm/rustllvm.def.in
index 3649662654c9..d314c253e88e 100644
--- a/src/rustllvm/rustllvm.def.in
+++ b/src/rustllvm/rustllvm.def.in
@@ -46,6 +46,7 @@ LLVMAddInternalizePass
 LLVMAddJumpThreadingPass
 LLVMAddLICMPass
 LLVMAddLoopDeletionPass
+LLVMAddLoopIdiomPass
 LLVMAddLoopRotatePass
 LLVMAddLoopUnrollPass
 LLVMAddLoopUnswitchPass