diff --git a/sample/CMakeLists.txt b/sample/CMakeLists.txt
index a98ccdd..3a18be0 100644
--- a/sample/CMakeLists.txt
+++ b/sample/CMakeLists.txt
@@ -1,4 +1,4 @@
-SET(tolink CosmoTool ${CosmoTool_LIBS})
+SET(tolink ${GSL_LIBRARIES} CosmoTool ${CosmoTool_LIBS})
 include_directories(${CMAKE_SOURCE_DIR}/src ${FFTW3_INCLUDE_DIRS} ${EIGEN3_INCLUDE_DIRS} ${NETCDF_INCLUDE_PATH} ${GSL_INCLUDE_PATH})
 
 add_executable(testBQueue testBQueue.cpp)
diff --git a/sample/testReadFlash.cpp b/sample/testReadFlash.cpp
index 4b1c320..61d038e 100644
--- a/sample/testReadFlash.cpp
+++ b/sample/testReadFlash.cpp
@@ -9,7 +9,7 @@ using namespace std;
 
 int main () {
  
-  char* filename = "lss_read_hdf5_chk_0000";
+  const char* filename = "lss_read_hdf5_chk_0000";
  
   SimuData* data = CosmoTool::loadFlashMulti(filename, 0, 0);