diff --git a/samples/usm/999_bigusm/main.cpp b/samples/usm/999_bigusm/main.cpp
index 86a040c..1066e5b 100644
--- a/samples/usm/999_bigusm/main.cpp
+++ b/samples/usm/999_bigusm/main.cpp
@@ -20,9 +20,9 @@
 // SOFTWARE.
 */
 
-#include <CL/opencl.hpp>
+#include <popl/popl.hpp>
 
-constexpr size_t BIG_ALLOC = 5ULL * 1024 * 1024 * 1024;    // 5GB
+#include <CL/opencl.hpp>
 
 #define CL_MEM_FLAGS_INTEL 0x10001
 #define CL_MEM_ALLOW_UNRESTRICTED_SIZE_INTEL (1 << 23)
@@ -36,49 +36,34 @@ int main(
     int argc,
     char** argv )
 {
-    bool printUsage = false;
     int platformIndex = 0;
     int deviceIndex = 0;
+    float numGB = 5.0f;
 
-    if( argc < 1 )
-    {
-        printUsage = true;
-    }
-    else
     {
-        for( size_t i = 1; i < argc; i++ )
-        {
-            if( !strcmp( argv[i], "-d" ) )
-            {
-                if( ++i < argc )
-                {
-                    deviceIndex = strtol(argv[i], NULL, 10);
-                }
-            }
-            else if( !strcmp( argv[i], "-p" ) )
-            {
-                if( ++i < argc )
-                {
-                    platformIndex = strtol(argv[i], NULL, 10);
-                }
-            }
-            else
-            {
-                printUsage = true;
-            }
+        popl::OptionParser op("Supported Options");
+        op.add<popl::Value<int>>("p", "platform", "Platform Index", platformIndex, &platformIndex);
+        op.add<popl::Value<int>>("d", "device", "Device Index", deviceIndex, &deviceIndex);
+        op.add<popl::Value<float>>("s", "size", "Size to Allocate (GB)", numGB, &numGB);
+        bool printUsage = false;
+        try {
+            op.parse(argc, argv);
+        } catch (std::exception& e) {
+            fprintf(stderr, "Error: %s\n\n", e.what());
+            printUsage = true;
+        }
+
+        if (printUsage || !op.unknown_options().empty() || !op.non_option_args().empty()) {
+            fprintf(stderr,
+                "Usage: bigusm [options]\n"
+                "%s", op.help().c_str());
+            return -1;
         }
     }
-    if( printUsage )
-    {
-        fprintf(stderr,
-            "Usage: bigusm [options]\n"
-            "Options:\n"
-            "      -d: Device Index (default = 0)\n"
-            "      -p: Platform Index (default = 0)\n"
-            );
-
-        return -1;
-    }
+
+    printf("numGB = %f\n", numGB);
+
+    size_t BIG_ALLOC = numGB * 1024 * 1024 * 1024;
 
     std::vector<cl::Platform> platforms;
     cl::Platform::get(&platforms);