diff --git a/benchmarks/concurrency.cpp b/benchmarks/concurrency.cpp
index 9374a99d0f..55d03ce15f 100755
--- a/benchmarks/concurrency.cpp
+++ b/benchmarks/concurrency.cpp
@@ -172,10 +172,10 @@ struct ticket_mutex {
 };
 
 struct sem_mutex {
-    void lock() noexcept {
+    _ABI void lock() noexcept {
         c.acquire();
     }
-    void unlock() noexcept {
+    _ABI void unlock() noexcept {
         c.release();
     }
     sem_mutex() : c(1) { }
diff --git a/benchmarks/concurrency.cu b/benchmarks/concurrency.cu
index 1b82814fa8..e3b7bf5832 100644
--- a/benchmarks/concurrency.cu
+++ b/benchmarks/concurrency.cu
@@ -1 +1 @@
-#include "benchmark.cpp"
+#include "concurrency.cpp"