Index: mlir/lib/Conversion/GPUCommon/GPUToLLVMConversion.cpp
===================================================================
--- mlir/lib/Conversion/GPUCommon/GPUToLLVMConversion.cpp
+++ mlir/lib/Conversion/GPUCommon/GPUToLLVMConversion.cpp
@@ -680,8 +680,7 @@
   for (const auto &en : llvm::enumerate(arguments)) {
     Value fieldPtr = builder.create<LLVM::GEPOp>(
         loc, getTypeConverter()->getPointerType(argumentTypes[en.index()]),
-        argumentTypes[en.index()], structPtr,
-        ArrayRef<LLVM::GEPArg>{0, en.index()});
+        structType, structPtr, ArrayRef<LLVM::GEPArg>{0, en.index()});
     builder.create<LLVM::StoreOp>(loc, en.value(), fieldPtr);
     auto elementPtr = builder.create<LLVM::GEPOp>(
         loc, llvmPointerPointerType, llvmPointerType, arrayPtr,
Index: mlir/test/Conversion/GPUCommon/lower-launch-func-to-gpu-runtime-calls.mlir
===================================================================
--- mlir/test/Conversion/GPUCommon/lower-launch-func-to-gpu-runtime-calls.mlir
+++ mlir/test/Conversion/GPUCommon/lower-launch-func-to-gpu-runtime-calls.mlir
@@ -40,9 +40,18 @@
 
   // CHECK: [[STREAM:%.*]] = llvm.call @mgpuStreamCreate
 
+  // CHECK: %[[ONE:.*]] = llvm.mlir.constant(1 : i32)
+  // CHECK: %[[MEMREF:.*]] = llvm.alloca %[[ONE]] x !llvm.struct[[STRUCT_BODY:<.*>]]
   // CHECK: [[NUM_PARAMS:%.*]] = llvm.mlir.constant(6 : i32) : i32
   // CHECK-NEXT: [[PARAMS:%.*]] = llvm.alloca [[NUM_PARAMS]] x !llvm.ptr
 
+  // CHECK: llvm.getelementptr %[[MEMREF]][0, 0] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct[[STRUCT_BODY:<.*>]]
+  // CHECK: llvm.getelementptr %[[MEMREF]][0, 1] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct[[STRUCT_BODY:<.*>]]
+  // CHECK: llvm.getelementptr %[[MEMREF]][0, 2] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct[[STRUCT_BODY:<.*>]]
+  // CHECK: llvm.getelementptr %[[MEMREF]][0, 3] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct[[STRUCT_BODY:<.*>]]
+  // CHECK: llvm.getelementptr %[[MEMREF]][0, 4] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct[[STRUCT_BODY:<.*>]]
+  // CHECK: llvm.getelementptr %[[MEMREF]][0, 5] : (!llvm.ptr) -> !llvm.ptr, !llvm.struct[[STRUCT_BODY:<.*>]]
+
   // CHECK: [[EXTRA_PARAMS:%.*]] = llvm.mlir.null : !llvm.ptr
 
   // CHECK: llvm.call @mgpuLaunchKernel([[FUNC]], [[C8]], [[C8]], [[C8]],