diff --git a/Samples/5_Domain_Specific/marchingCubes/marchingCubes.cpp b/Samples/5_Domain_Specific/marchingCubes/marchingCubes.cpp
index 94072734..0e052750 100644
--- a/Samples/5_Domain_Specific/marchingCubes/marchingCubes.cpp
+++ b/Samples/5_Domain_Specific/marchingCubes/marchingCubes.cpp
@@ -416,8 +416,8 @@ void initMC(int argc, char **argv) {
     gridSizeLog2.x = n;
   }
 
-  if (checkCmdLineFlag(argc, (const char **)argv, "gridx")) {
-    n = getCmdLineArgumentInt(argc, (const char **)argv, "gridx");
+  if (checkCmdLineFlag(argc, (const char **)argv, "gridy")) {
+    n = getCmdLineArgumentInt(argc, (const char **)argv, "gridy");
     gridSizeLog2.y = n;
   }