diff --git a/test/Transforms/DeadArgElim/deadexternal.ll b/test/Transforms/DeadArgElim/deadexternal.ll
new file mode 100644
index 00000000000..84341781da2
--- /dev/null
+++ b/test/Transforms/DeadArgElim/deadexternal.ll
@@ -0,0 +1,12 @@
+; RUN: opt -deadargelim -S %s | FileCheck %s
+
+define void @test(i32) {
+  ret void
+}
+
+define void @foo() {
+  call void @test(i32 0)
+  ret void
+; CHECK: @foo
+; CHECK: i32 undef
+}