diff --git a/validat1.cpp b/validat1.cpp
index baadb46a..f337ca18 100644
--- a/validat1.cpp
+++ b/validat1.cpp
@@ -300,7 +300,7 @@ bool TestOS_RNG()
 		}
 		else
 			cout << "passed:";
-		cout << "  " << total << " generated bytes compressed to " << sink->TotalPutLength() << " bytes by DEFLATE" << endl;
+		cout << "  " << total << " generated bytes compressed to " << (size_t)sink->TotalPutLength() << " bytes by DEFLATE" << endl;
 	}
 	else
 		cout << "\nNo operating system provided blocking random number generator, skipping test." << endl;
@@ -325,7 +325,7 @@ bool TestOS_RNG()
 		}
 		else
 			cout << "passed:";
-		cout << "  100000 generated bytes compressed to " << sink->TotalPutLength() << " bytes by DEFLATE" << endl;
+		cout << "  100000 generated bytes compressed to " << (size_t)sink->TotalPutLength() << " bytes by DEFLATE" << endl;
 	}
 	else
 		cout << "\nNo operating system provided nonblocking random number generator, skipping test." << endl;