diff --git a/src/loadGadget.cpp b/src/loadGadget.cpp
index 4ccbe00..542fbfa 100644
--- a/src/loadGadget.cpp
+++ b/src/loadGadget.cpp
@@ -172,9 +172,9 @@ SimuData *CosmoTool::loadGadgetMulti(const char *fname, int id,
 
   ssize_t NumPart = 0, NumPartTotal = 0;
 #define ENSURE2(name,out_sz) { \
+    int64_t sz; \
     if (GadgetFormat == 2) { \
      BlockMap::iterator iter = blockTable.find(name); \
-     int64_t sz; \
      if (iter == blockTable.end()) { \
         std::cerr << "GADGET2: Cannot find block named '" << name << "'" << endl; \
         if (data) delete data; \
@@ -184,7 +184,14 @@ SimuData *CosmoTool::loadGadgetMulti(const char *fname, int id,
      f->seek(iter->second.position); \
      sz = iter->second.size; \
      out_sz = sz;\
+    } else if (GadgetFormat==1) { \
+      int64_t oldpos = f->position(); \
+      f->beginCheckpoint(); \
+      out_sz = f->getBlockSize(); \
+      f->endCheckpoint(true); \
+      f->seek(oldpos); \
     } \
+\
   } 
 #define ENSURE(name) ENSURE2(name,sz);