diff --git a/tmtcpacket/pus/TcPacketBase.cpp b/tmtcpacket/pus/TcPacketBase.cpp
index 4ef50c0d4..f8dba79f2 100644
--- a/tmtcpacket/pus/TcPacketBase.cpp
+++ b/tmtcpacket/pus/TcPacketBase.cpp
@@ -28,7 +28,7 @@ const uint8_t* TcPacketBase::getApplicationData() const {
 	return &tcData->data;
 }
 
-size_t TcPacketBase::getApplicationDataSize() {
+uint16_t TcPacketBase::getApplicationDataSize() {
 	return getPacketDataLength() - sizeof(tcData->data_field) - CRC_SIZE + 1;
 }
 
diff --git a/tmtcpacket/pus/TcPacketBase.h b/tmtcpacket/pus/TcPacketBase.h
index c83428960..136aaa0b8 100644
--- a/tmtcpacket/pus/TcPacketBase.h
+++ b/tmtcpacket/pus/TcPacketBase.h
@@ -153,7 +153,7 @@ public:
 	 * @return	The size of the PUS Application Data (without Error Control
 	 * 		field)
 	 */
-	size_t getApplicationDataSize();
+	uint16_t getApplicationDataSize();
 	/**
 	 * This getter returns the Error Control Field of the packet.
 	 *