diff --git a/runtime/nvqir/custatevec/CuStateVecCircuitSimulator.cpp b/runtime/nvqir/custatevec/CuStateVecCircuitSimulator.cpp
index 70cce324e2..207529a303 100644
--- a/runtime/nvqir/custatevec/CuStateVecCircuitSimulator.cpp
+++ b/runtime/nvqir/custatevec/CuStateVecCircuitSimulator.cpp
@@ -189,9 +189,14 @@ class CuStateVecCircuitSimulator
         return;
       }
 
-      // User state provided...
+      // Check if the pointer is a device pointer
+      cudaPointerAttributes attributes;
+      HANDLE_CUDA_ERROR(cudaPointerGetAttributes(&attributes, state));
 
-      // FIXME handle case where pointer is a device pointer
+      if (attributes.type == cudaMemoryTypeDevice) {
+        throw std::invalid_argument(
+            "[CuStateVecCircuitSimulator] Incompatible host pointer");
+      }
 
       // First allocation, so just set the user provided data here
       ScopedTraceWithContext(
@@ -200,6 +205,7 @@ class CuStateVecCircuitSimulator
       HANDLE_CUDA_ERROR(cudaMemcpy(deviceStateVector, state,
                                    stateDimension * sizeof(CudaDataType),
                                    cudaMemcpyHostToDevice));
+
       return;
     }
 
@@ -221,8 +227,15 @@ class CuStateVecCircuitSimulator
           n_blocks, threads_per_block, otherState, (1UL << count));
       HANDLE_CUDA_ERROR(cudaGetLastError());
     } else {
+      // Check if the pointer is a device pointer
+      cudaPointerAttributes attributes;
+      HANDLE_CUDA_ERROR(cudaPointerGetAttributes(&attributes, state));
+
+      if (attributes.type == cudaMemoryTypeDevice) {
+        throw std::invalid_argument(
+            "[CuStateVecCircuitSimulator] Incompatible host pointer");
+      }
 
-      // FIXME Handle case where data is already on GPU
       HANDLE_CUDA_ERROR(cudaMemcpy(otherState, state,
                                    (1UL << count) * sizeof(CudaDataType),
                                    cudaMemcpyHostToDevice));