diff --git a/lib/cppcheck.cpp b/lib/cppcheck.cpp
index f35caf5c5..01c5130a1 100644
--- a/lib/cppcheck.cpp
+++ b/lib/cppcheck.cpp
@@ -339,7 +339,8 @@ void CppCheck::checkFile(const std::string &code, const char FileName[])
         }
 
         // Update the _dependencies..
-        _dependencies.insert( _tokenizer.getFiles()->begin()+1, _tokenizer.getFiles()->end() );
+        if (_tokenizer.getFiles()->size() >= 2)
+            _dependencies.insert(_tokenizer.getFiles()->begin()+1, _tokenizer.getFiles()->end());
 
         // call all "runChecks" in all registered Check classes
         for (std::list<Check *>::iterator it = Check::instances().begin(); it != Check::instances().end(); ++it) {