diff --git a/networkinstruction.cpp b/networkinstruction.cpp
index 95edced..d63a627 100644
--- a/networkinstruction.cpp
+++ b/networkinstruction.cpp
@@ -97,8 +97,8 @@ bool FragmentAssembly::add_fragment( Instruction &inst )
   fprintf( stderr, "arrived = %d, total = %d\n", fragments_arrived, fragments_total );
 
   if ( fragments_arrived == fragments_total ) {
-    assert( fragments.size() == fragments_total );
-    for ( int i = 0; i < fragments.size(); i++ ) {
+    assert( (int)fragments.size() == fragments_total );
+    for ( unsigned int i = 0; i < fragments.size(); i++ ) {
       assert( fragments.at( i ).old_num != uint64_t(-1) );
     }
   }