diff --git a/src/fsfw_hal/linux/spi/SpiComIF.cpp b/src/fsfw_hal/linux/spi/SpiComIF.cpp
index 059025c8..ea25e837 100644
--- a/src/fsfw_hal/linux/spi/SpiComIF.cpp
+++ b/src/fsfw_hal/linux/spi/SpiComIF.cpp
@@ -179,12 +179,11 @@ ReturnValue_t SpiComIF::performRegularSendOperation(SpiCookie* spiCookie, const
   uint32_t spiSpeed = 0;
   spiCookie->getSpiParameters(spiMode, spiSpeed, nullptr);
   setSpiSpeedAndMode(fileDescriptor, spiMode, spiSpeed);
-  spiCookie->assignWriteBuffer(sendData);
-  spiCookie->setTransferSize(sendLen);
 
   bool fullDuplex = spiCookie->isFullDuplex();
   gpioId_t gpioId = spiCookie->getChipSelectPin();
   bool csLockManual = spiCookie->getCsLockManual();
+  spiCookie->setTransferSize(0);
 
   MutexIF::TimeoutType csType;
   dur_millis_t csTimeout = 0;
@@ -225,11 +224,15 @@ ReturnValue_t SpiComIF::performRegularSendOperation(SpiCookie* spiCookie, const
     updateLinePolarity(fileDescriptor);
   }
 
+  spiCookie->assignWriteBuffer(sendData);
+  spiCookie->setTransferSize(sendLen);
+
   /* Execute transfer */
   if (fullDuplex) {
     /* Initiate a full duplex SPI transfer. */
     retval = ioctl(fileDescriptor, SPI_IOC_MESSAGE(1), spiCookie->getTransferStructHandle());
     if (retval < 0) {
+      spiCookie->setTransferSize(0);
       utility::handleIoctlError("SpiComIF::sendMessage: ioctl error.");
       result = FULL_DUPLEX_TRANSFER_FAILED;
     }
@@ -239,6 +242,7 @@ ReturnValue_t SpiComIF::performRegularSendOperation(SpiCookie* spiCookie, const
   } else {
     /* We write with a blocking half-duplex transfer here */
     if (write(fileDescriptor, sendData, sendLen) != static_cast<ssize_t>(sendLen)) {
+      spiCookie->setTransferSize(0);
 #if FSFW_VERBOSE_LEVEL >= 1
 #if FSFW_CPP_OSTREAM_ENABLED == 1
       sif::warning << "SpiComIF::sendMessage: Half-Duplex write operation failed!" << std::endl;