diff --git a/components/esm3/aisequence.cpp b/components/esm3/aisequence.cpp
index 1c1d3bf6ce..668b36c871 100644
--- a/components/esm3/aisequence.cpp
+++ b/components/esm3/aisequence.cpp
@@ -13,13 +13,13 @@ namespace ESM
 
         void AiWander::load(ESMReader& esm)
         {
-            esm.getHNTSized<14>(mData, "DATA");
-            esm.getHNTSized<8>(mDurationData, "STAR"); // was mStartTime
+            esm.getHNT("DATA", mData.mDistance, mData.mDuration, mData.mTimeOfDay, mData.mIdle, mData.mShouldRepeat);
+            esm.getHNT("STAR", mDurationData.mRemainingDuration, mDurationData.unused); // was mStartTime
             mStoredInitialActorPosition = false;
             if (esm.isNextSub("POS_"))
             {
                 mStoredInitialActorPosition = true;
-                esm.getHTSized<12>(mInitialActorPosition);
+                esm.getHT(mInitialActorPosition.mValues);
             }
         }
 
@@ -33,7 +33,7 @@ namespace ESM
 
         void AiTravel::load(ESMReader& esm)
         {
-            esm.getHNTSized<12>(mData, "DATA");
+            esm.getHNT("DATA", mData.mX, mData.mY, mData.mZ);
             esm.getHNOT(mHidden, "HIDD");
             mRepeat = false;
             esm.getHNOT(mRepeat, "REPT");
@@ -49,7 +49,7 @@ namespace ESM
 
         void AiEscort::load(ESMReader& esm)
         {
-            esm.getHNTSized<14>(mData, "DATA");
+            esm.getHNT("DATA", mData.mX, mData.mY, mData.mZ, mData.mDuration);
             mTargetId = esm.getHNRefId("TARG");
             mTargetActorId = -1;
             esm.getHNOT(mTargetActorId, "TAID");
@@ -81,7 +81,7 @@ namespace ESM
 
         void AiFollow::load(ESMReader& esm)
         {
-            esm.getHNTSized<14>(mData, "DATA");
+            esm.getHNT("DATA", mData.mX, mData.mY, mData.mZ, mData.mDuration);
             mTargetId = esm.getHNRefId("TARG");
             mTargetActorId = -1;
             esm.getHNOT(mTargetActorId, "TAID");
diff --git a/components/esm3/aisequence.hpp b/components/esm3/aisequence.hpp
index 1e27a0afdd..107fdf3bdb 100644
--- a/components/esm3/aisequence.hpp
+++ b/components/esm3/aisequence.hpp
@@ -1,6 +1,7 @@
 #ifndef OPENMW_COMPONENTS_ESM_AISEQUENCE_H
 #define OPENMW_COMPONENTS_ESM_AISEQUENCE_H
 
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <vector>
@@ -38,8 +39,8 @@ namespace ESM
 #pragma pack(push, 1)
         struct AiWanderData
         {
-            short mDistance;
-            short mDuration;
+            int16_t mDistance;
+            int16_t mDuration;
             unsigned char mTimeOfDay;
             unsigned char mIdle[8];
             unsigned char mShouldRepeat;
@@ -47,7 +48,7 @@ namespace ESM
         struct AiWanderDuration
         {
             float mRemainingDuration;
-            int unused;
+            int32_t unused;
         };
         struct AiTravelData
         {
@@ -56,7 +57,7 @@ namespace ESM
         struct AiEscortData
         {
             float mX, mY, mZ;
-            short mDuration;
+            int16_t mDuration;
         };
 
 #pragma pack(pop)
@@ -89,7 +90,7 @@ namespace ESM
         {
             AiEscortData mData;
 
-            int mTargetActorId;
+            int32_t mTargetActorId;
             ESM::RefId mTargetId;
             std::string mCellId;
             float mRemainingDuration;
@@ -103,7 +104,7 @@ namespace ESM
         {
             AiEscortData mData;
 
-            int mTargetActorId;
+            int32_t mTargetActorId;
             ESM::RefId mTargetId;
             std::string mCellId;
             float mRemainingDuration;
@@ -129,7 +130,7 @@ namespace ESM
 
         struct AiCombat : AiPackage
         {
-            int mTargetActorId;
+            int32_t mTargetActorId;
 
             void load(ESMReader& esm);
             void save(ESMWriter& esm) const;
@@ -137,7 +138,7 @@ namespace ESM
 
         struct AiPursue : AiPackage
         {
-            int mTargetActorId;
+            int32_t mTargetActorId;
 
             void load(ESMReader& esm);
             void save(ESMWriter& esm) const;
@@ -145,7 +146,7 @@ namespace ESM
 
         struct AiPackageContainer
         {
-            int mType;
+            int32_t mType;
 
             std::unique_ptr<AiPackage> mPackage;
         };
@@ -155,7 +156,7 @@ namespace ESM
             AiSequence() { mLastAiPackage = -1; }
 
             std::vector<AiPackageContainer> mPackages;
-            int mLastAiPackage;
+            int32_t mLastAiPackage;
 
             void load(ESMReader& esm);
             void save(ESMWriter& esm) const;
diff --git a/components/esm3/esmreader.hpp b/components/esm3/esmreader.hpp
index 1a783d56bd..5ccd526dd4 100644
--- a/components/esm3/esmreader.hpp
+++ b/components/esm3/esmreader.hpp
@@ -172,10 +172,14 @@ namespace ESM
         }
 
         // Get data of a given type/size, including subrecord header
-        template <typename X, typename = std::enable_if_t<IsReadable<X>>>
-        void getHT(X& x)
+        template <class... Args>
+        void getHT(Args&... args)
         {
-            getHTSized<sizeof(X)>(x);
+            constexpr size_t size = (0 + ... + sizeof(Args));
+            getSubHeader();
+            if (mCtx.leftSub != size)
+                reportSubSizeMismatch(size, mCtx.leftSub);
+            (getT(args), ...);
         }
 
         template <typename T, typename = std::enable_if_t<IsReadable<T>>>