diff --git a/examples/benchmark.py b/examples/benchmark.py
index 0408fd28fc3917364eb208421f58ec8bec074835..30c0b8fba137f7ef16331f877659fbeb0eb0cae3 100644
--- a/examples/benchmark.py
+++ b/examples/benchmark.py
@@ -54,7 +54,6 @@ for platform in cl.get_platforms():
         dest_buf = cl.Buffer(ctx, mf.WRITE_ONLY, b.nbytes)
 
         prg = cl.Program(ctx, """
-            #pragma OPENCL EXTENSION cl_khr_fp64 : enable
             __kernel void sum(__global const float *a,
             __global const float *b, __global float *c)
             {
@@ -68,7 +67,7 @@ for platform in cl.get_platforms():
                         
                         c_temp = a_temp+b_temp; // sum of my elements
                         c_temp = c_temp * c_temp; // product of sums
-                        c_temp = c_temp * (a_temp/2.0); // times 1/2 my a
+                        c_temp = c_temp * (a_temp/2.0f); // times 1/2 my a
 
                         c[gid] = c_temp; // store result in global memory
                 }