diff --git a/main.cpp b/main.cpp
index df36d85..0108e31 100644
--- a/main.cpp
+++ b/main.cpp
@@ -155,7 +155,7 @@ class BinaryEncryptionStrategy : public EncryptionStrategy
     {
         std::stringstream decoded;
 
-        for (auto segmentIterator{text.begin()}; segmentIterator != text.end(); segmentIterator += 8)
+        for (std::string::const_iterator segmentIterator{text.begin()}; segmentIterator != text.end(); segmentIterator += 8)
         {
             std::string segment(segmentIterator, segmentIterator + 8);
             auto ASCII = std::stoull(segment, nullptr, 2);