diff --git a/mcp2515.cpp b/mcp2515.cpp
index 833a133..88c91b2 100644
--- a/mcp2515.cpp
+++ b/mcp2515.cpp
@@ -573,6 +573,10 @@ MCP2515::ERROR MCP2515::setFilter(const RXF num, const bool ext, const uint32_t
 
 MCP2515::ERROR MCP2515::sendMessage(const TXBn txbn, const struct can_frame *frame)
 {
+    if (frame->can_dlc > CAN_MAX_DLEN) {
+        return ERROR_FAILTX;
+    }
+
     const struct TXBn_REGS *txbuf = &TXB[txbn];
 
     uint8_t data[13];