diff --git a/include/Athena/DNAYaml.hpp b/include/Athena/DNAYaml.hpp
index f5af691..4afe113 100644
--- a/include/Athena/DNAYaml.hpp
+++ b/include/Athena/DNAYaml.hpp
@@ -483,7 +483,7 @@ public:
         vector.clear();
         vector.reserve(count);
         enterSubVector(name);
-        for (int i=0 ; i<count ; ++i)
+        for (size_t i=0 ; i<count ; ++i)
         {
             vector.emplace_back();
             enterSubRecord(nullptr);
@@ -503,7 +503,7 @@ public:
         vector.clear();
         vector.reserve(count);
         enterSubVector(name);
-        for (int i=0 ; i<count ; ++i)
+        for (size_t i=0 ; i<count ; ++i)
             vector.emplace_back(readVal<T>(name));
         leaveSubVector();
     }
@@ -515,7 +515,7 @@ public:
         vector.clear();
         vector.reserve(count);
         enterSubVector(name);
-        for (int i=0 ; i<count ; ++i)
+        for (size_t i=0 ; i<count ; ++i)
         {
             vector.emplace_back();
             enterSubRecord(nullptr);
diff --git a/include/Athena/IStreamReader.hpp b/include/Athena/IStreamReader.hpp
index 77ce512..cecb41c 100644
--- a/include/Athena/IStreamReader.hpp
+++ b/include/Athena/IStreamReader.hpp
@@ -447,7 +447,7 @@ public:
     {
         vector.clear();
         vector.reserve(count);
-        for (int i=0 ; i<count ; ++i)
+        for (size_t i=0 ; i<count ; ++i)
             vector.emplace_back(readVal<T>());
     }
 
@@ -460,7 +460,7 @@ public:
     {
         vector.clear();
         vector.reserve(count);
-        for (int i=0 ; i<count ; ++i)
+        for (size_t i=0 ; i<count ; ++i)
         {
             vector.emplace_back();
             vector.back().read(*this);
@@ -472,7 +472,7 @@ public:
     {
         vector.clear();
         vector.reserve(count);
-        for (int i=0 ; i<count ; ++i)
+        for (size_t i=0 ; i<count ; ++i)
         {
             vector.emplace_back();
             readf(*this, vector.back());