diff --git a/gen/tocall.cpp b/gen/tocall.cpp
index f13c044f..a48ad2b1 100644
--- a/gen/tocall.cpp
+++ b/gen/tocall.cpp
@@ -122,11 +122,12 @@ const LLFunctionType* DtoExtractFunctionType(const LLType* type)
 void DtoBuildDVarArgList(std::vector<LLValue*>& args, std::vector<llvm::AttributeWithIndex>& attrs, TypeFunction* tf, Expressions* arguments, size_t argidx)
 {
     Logger::println("doing d-style variadic arguments");
+    LOG_SCOPE
 
     std::vector<const LLType*> vtypes;
 
     // number of non variadic args
-    int begin = tf->parameters->dim;
+    int begin = Argument::dim(tf->parameters);
     Logger::println("num non vararg params = %d", begin);
 
     // get n args in arguments list
@@ -136,6 +137,7 @@ void DtoBuildDVarArgList(std::vector<LLValue*>& args, std::vector<llvm::Attribut
     for (int i=begin; i<n_arguments; i++)
     {
         Expression* argexp = (Expression*)arguments->data[i];
+        assert(argexp->type->ty != Ttuple);
         vtypes.push_back(DtoType(argexp->type));
         size_t sz = getTypePaddedSize(vtypes.back());
         if (sz < PTRSIZE)
diff --git a/tests/mini/tuple_and_vararg.d b/tests/mini/tuple_and_vararg.d
new file mode 100644
index 00000000..a6d3d901
--- /dev/null
+++ b/tests/mini/tuple_and_vararg.d
@@ -0,0 +1,13 @@
+// Based on dstress.run.t.tuple_15_A;
+
+module tuple_and_vararg;
+
+template TypeTuple(TList...){
+	alias TList TypeTuple;
+}
+
+void main(){
+	auto y = function(TypeTuple!(uint,uint) ab, ...){};
+        y(1, 2);
+        y(1, 2, "foo", 3.0);
+}