diff --git a/src/knx/memory.cpp b/src/knx/memory.cpp
index 5d33148..c7bdd00 100644
--- a/src/knx/memory.cpp
+++ b/src/knx/memory.cpp
@@ -127,7 +127,7 @@ void Memory::readMemory()
 void Memory::writeMemory()
 {
     // first get the necessary size of the writeBuffer
-    size_t writeBufferSize = _metadataSize;
+    uint16_t writeBufferSize = _metadataSize;
     for (int i = 0; i < _saveCount; i++)
         writeBufferSize = MAX(writeBufferSize, _saveRestores[i]->saveSize());
 
diff --git a/src/knx/platform.cpp b/src/knx/platform.cpp
index a66a341..3c2a74e 100644
--- a/src/knx/platform.cpp
+++ b/src/knx/platform.cpp
@@ -181,8 +181,8 @@ uint32_t Platform::writeNonVolatileMemory(uint32_t relativeAddress, uint8_t* buf
             uint32_t start = _bufferedEraseblockNumber * (flashEraseBlockSize() * flashPageSize());
             uint32_t end = start +  (flashEraseBlockSize() * flashPageSize());
 
-            ptrdiff_t offset = relativeAddress - start;
-            ptrdiff_t length = end - relativeAddress;
+            uint32_t offset = relativeAddress - start;
+            uint32_t length = end - relativeAddress;
             if(length > size)
                 length = size;
             memcpy(_eraseblockBuffer + offset, buffer, length);
@@ -227,7 +227,7 @@ void Platform::writeBufferedEraseBlock()
     if(_bufferedEraseblockNumber > -1 && _bufferedEraseblockDirty)
     {
         flashErase(_bufferedEraseblockNumber);
-        for(int i = 0; i < flashEraseBlockSize(); i++)
+        for(uint32_t i = 0; i < flashEraseBlockSize(); i++)
         {   
             int32_t pageNumber = _bufferedEraseblockNumber * flashEraseBlockSize() + i;
             uint8_t *data = _eraseblockBuffer + flashPageSize() * i;
@@ -238,7 +238,7 @@ void Platform::writeBufferedEraseBlock()
 }
 
 
-void Platform::bufferEraseBlock(uint32_t eraseBlockNumber)
+void Platform::bufferEraseBlock(int32_t eraseBlockNumber)
 {
     if(_bufferedEraseblockNumber == eraseBlockNumber)
         return;
diff --git a/src/knx/platform.h b/src/knx/platform.h
index 2aaf758..21a2867 100644
--- a/src/knx/platform.h
+++ b/src/knx/platform.h
@@ -104,7 +104,7 @@ class Platform
     // writes _eraseblockBuffer to flash
     virtual void writeBufferedEraseBlock();
     // copies a EraseBlock into the _eraseblockBuffer
-    void bufferEraseBlock(uint32_t eraseBlockNumber);
+    void bufferEraseBlock(int32_t eraseBlockNumber);
 
     // in theory we would have to use this buffer for memory reads too,
     // but because ets always restarts the device after programming it
diff --git a/src/knx/table_object.cpp b/src/knx/table_object.cpp
index 1f670a9..90e6624 100644
--- a/src/knx/table_object.cpp
+++ b/src/knx/table_object.cpp
@@ -110,7 +110,7 @@ bool TableObject::allocTable(uint32_t size, bool doFill, uint8_t fillByte)
     if (doFill)
     {
         uint32_t addr = _memory.toRelative(_data);
-        for(int i = 0; i< size;i++)
+        for(uint32_t i = 0; i < size;i++)
             _memory.writeMemory(addr+i, 1, &fillByte);
     }