diff --git a/src/fsfw_hal/linux/spi/SpiComIF.cpp b/src/fsfw_hal/linux/spi/SpiComIF.cpp
index 11db7cfe..2f84275e 100644
--- a/src/fsfw_hal/linux/spi/SpiComIF.cpp
+++ b/src/fsfw_hal/linux/spi/SpiComIF.cpp
@@ -214,6 +214,7 @@ ReturnValue_t SpiComIF::performRegularSendOperation(SpiCookie* spiCookie, const
       sif::printWarning("SpiComIF::sendMessage: Pulling low CS pin failed");
 #endif
 #endif
+      csMutex->unlockMutex();
       return result;
     }
   } else {