diff --git a/Kangaroo.cpp b/Kangaroo.cpp
index 33104744..ba7d13e5 100644
--- a/Kangaroo.cpp
+++ b/Kangaroo.cpp
@@ -947,6 +947,8 @@ void Kangaroo::Run(int nbThread,std::vector<int> gpuId,std::vector<int> gridSize
     int x = gridSize[2ULL * i];
     int y = gridSize[2ULL * i + 1ULL];
     if(!GPUEngine::GetGridSize(gpuId[i],&x,&y)) {
+      free(params);
+      free(thHandles);
       return;
     } else {
       params[nbCPUThread + i].gridSizeX = x;