diff --git a/hphp/runtime/vm/jit/ir.h b/hphp/runtime/vm/jit/ir.h
index 75e526be7..8300418d0 100644
--- a/hphp/runtime/vm/jit/ir.h
+++ b/hphp/runtime/vm/jit/ir.h
@@ -184,7 +184,7 @@ class FailedCodeGen : public std::runtime_error {
 #define IR_OPCODES                                                            \
 /*    name                      dstinfo srcinfo                      flags */ \
 O(CheckType,                    DParam, S(Gen,Nullptr),          E|CRc|PRc|P) \
-O(AssertType,                   DParam, S(Gen,Nullptr),        C|E|CRc|PRc|P) \
+O(AssertType,                   DParam, S(Gen,Nullptr,Cls),    C|E|CRc|PRc|P) \
 O(CheckTypeMem,                     ND, S(PtrToGen),                       E) \
 O(GuardLoc,                         ND, S(FramePtr),                       E) \
 O(GuardStk,                  D(StkPtr), S(StkPtr),                         E) \