diff --git a/CUDA/cudapi.cu b/CUDA/cudapi.cu
index 2586924fe8b629ab7f9ba8b44e961b18ee6ca969..f6df1cfef084eb131fbc42504de5e336642118b4 100755
--- a/CUDA/cudapi.cu
+++ b/CUDA/cudapi.cu
@@ -12,7 +12,7 @@ uint64_t blocks = 1024;
 uint64_t threads = 1024;
 uint64_t nloop = 1000000;
 uint64_t npts = blocks*threads;
-void cudaCheck(string msg) {
+void cudaCheck(char *msg) {
    cudaError err;
    err = cudaGetLastError();
    if (cudaSuccess != err)