diff --git a/src/Chapter_7/SimpleBufferSubBuffer/simple.cl b/src/Chapter_7/SimpleBufferSubBuffer/simple.cl
index df79415..a44277c 100755
--- a/src/Chapter_7/SimpleBufferSubBuffer/simple.cl
+++ b/src/Chapter_7/SimpleBufferSubBuffer/simple.cl
@@ -12,8 +12,8 @@
 //
 //    This is a simple example demonstrating buffers and sub-buffer usage
 
-__kernel void square(__global * buffer)
+__kernel void square(__global int * buffer)
 {
 	size_t id = get_global_id(0);
 	buffer[id] = buffer[id] * buffer[id];
-}
\ No newline at end of file
+}