diff --git a/Makefile.rules b/Makefile.rules
index ab5ee883905..142b62e421e 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -1206,6 +1206,7 @@ ifdef TARGET
 
 TDFiles := $(strip $(wildcard $(PROJ_SRC_DIR)/*.td) \
            $(LLVM_SRC_ROOT)/lib/Target/Target.td \
+           $(LLVM_SRC_ROOT)/lib/Target/TargetCallingConv.td \
            $(LLVM_SRC_ROOT)/lib/Target/TargetSelectionDAG.td \
            $(LLVM_SRC_ROOT)/include/llvm/CodeGen/ValueTypes.td) \
            $(wildcard $(LLVM_SRC_ROOT)/include/llvm/Intrinsics*.td)