diff --git a/src/loadRamses.cpp b/src/loadRamses.cpp
index 4dcbad2..5cd2e1e 100644
--- a/src/loadRamses.cpp
+++ b/src/loadRamses.cpp
@@ -318,6 +318,9 @@ CosmoTool::SimuData *CosmoTool::loadRamsesSimu(const char *basename, int outputI
   data->Omega_M = info.omega_m;
   data->Omega_Lambda = info.omega_lambda;
 
+  if (flags == 0)
+    return data;
+
   if (cpuid < 0)
     cpuid = 1;
   else cpuid++;