diff --git a/kernels/minimal_kernel.c b/kernels/minimal_kernel.c
index 4a312ca..30e61e5 100644
--- a/kernels/minimal_kernel.c
+++ b/kernels/minimal_kernel.c
@@ -1,5 +1,9 @@
-__kernel void min_kern(__global char* in)
+__kernel void min_kern(
+        global char* in,
+        global char* map,
+        global int3 map_dim)
 {
     int a = 10;
-    printf("%s\n", "this is a test string\n");
+    size_t id = get_global_id(0);
+    printf("%c%i\n", in[id], id);
 }
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 10f32ac..4c5aea2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -47,7 +47,7 @@ int main(){
     std::string in = "hello!!!!!!!!!!!!!!!!!!!!!";
     cl_mem buff = clCreateBuffer(
             c.getContext(), CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR,
-            sizeof(char) * 128, NULL, NULL);
+            sizeof(char) * 128, &in[0], NULL);
 
     c.store_buffer(buff, "buffer_1");