diff --git a/components/esm3/esmreader.cpp b/components/esm3/esmreader.cpp
index 92a04fb487..c52e739f5f 100644
--- a/components/esm3/esmreader.cpp
+++ b/components/esm3/esmreader.cpp
@@ -244,16 +244,16 @@ namespace ESM
         skipHString();
     }
 
-    void ESMReader::getHExact(void* p, int size)
+    void ESMReader::getHExact(void* p, std::size_t size)
     {
         getSubHeader();
-        if (size != static_cast<int>(mCtx.leftSub))
+        if (size != mCtx.leftSub)
             reportSubSizeMismatch(size, mCtx.leftSub);
         getExact(p, size);
     }
 
     // Read the given number of bytes from a named subrecord
-    void ESMReader::getHNExact(void* p, int size, NAME name)
+    void ESMReader::getHNExact(void* p, std::size_t size, NAME name)
     {
         getSubNameIs(name);
         getHExact(p, size);
@@ -326,10 +326,10 @@ namespace ESM
         skip(mCtx.leftSub);
     }
 
-    void ESMReader::skipHSubSize(int size)
+    void ESMReader::skipHSubSize(std::size_t size)
     {
         skipHSub();
-        if (static_cast<int>(mCtx.leftSub) != size)
+        if (mCtx.leftSub != size)
             reportSubSizeMismatch(mCtx.leftSub, size);
     }
 
diff --git a/components/esm3/esmreader.hpp b/components/esm3/esmreader.hpp
index 7d0b9b980c..b67cc0f8bb 100644
--- a/components/esm3/esmreader.hpp
+++ b/components/esm3/esmreader.hpp
@@ -238,10 +238,10 @@ namespace ESM
         void skipHRefId();
 
         // Read the given number of bytes from a subrecord
-        void getHExact(void* p, int size);
+        void getHExact(void* p, std::size_t size);
 
         // Read the given number of bytes from a named subrecord
-        void getHNExact(void* p, int size, NAME name);
+        void getHNExact(void* p, std::size_t size, NAME name);
 
         ESM::FormId getFormId(bool wide = false, NAME tag = "FRMR");
 
@@ -275,7 +275,7 @@ namespace ESM
         void skipHSub();
 
         // Skip sub record and check its size
-        void skipHSubSize(int size);
+        void skipHSubSize(std::size_t size);
 
         // Skip all subrecords until the given subrecord or no more subrecords remaining
         void skipHSubUntil(NAME name);
diff --git a/components/esm3/loadland.cpp b/components/esm3/loadland.cpp
index 006510f21b..8b8a8f90fa 100644
--- a/components/esm3/loadland.cpp
+++ b/components/esm3/loadland.cpp
@@ -25,7 +25,7 @@ namespace ESM
 
         // Loads data and marks it as loaded. Return true if data is actually loaded from reader, false otherwise
         // including the case when data is already loaded.
-        bool condLoad(ESMReader& reader, int flags, int& targetFlags, int dataFlag, void* ptr, unsigned int size)
+        bool condLoad(ESMReader& reader, int flags, int& targetFlags, int dataFlag, void* ptr, std::size_t size)
         {
             if ((targetFlags & dataFlag) == 0 && (flags & dataFlag) != 0)
             {
@@ -94,7 +94,7 @@ namespace ESM
                     mDataTypes |= DATA_VHGT;
                     break;
                 case fourCC("WNAM"):
-                    esm.getHExact(mWnam.data(), static_cast<int>(mWnam.size()));
+                    esm.getHExact(mWnam.data(), mWnam.size());
                     mDataTypes |= DATA_WNAM;
                     break;
                 case fourCC("VCLR"):
diff --git a/components/esm3/loadlevlist.cpp b/components/esm3/loadlevlist.cpp
index 766fd42054..f37009d6f9 100644
--- a/components/esm3/loadlevlist.cpp
+++ b/components/esm3/loadlevlist.cpp
@@ -87,7 +87,7 @@ namespace ESM
 
         esm.writeHNT("DATA", mFlags);
         esm.writeHNT("NNAM", mChanceNone);
-        esm.writeHNT<uint32_t>("INDX", static_cast<int>(mList.size()));
+        esm.writeHNT("INDX", static_cast<uint32_t>(mList.size()));
 
         for (const auto& item : mList)
         {