diff --git a/mcp_can_dfs.h b/mcp_can_dfs.h
index 01e1aa9..42441a9 100644
--- a/mcp_can_dfs.h
+++ b/mcp_can_dfs.h
@@ -44,7 +44,10 @@
 /*
  *   Begin mt
  */
+#ifndef TIMEOUTVALUE
 #define TIMEOUTVALUE    2500                                           /* In Microseconds, May need changed depending on application and baud rate */
+#endif
+
 #define MCP_SIDH        0
 #define MCP_SIDL        1
 #define MCP_EID8        2