diff --git a/src/link/C/c_link.h b/src/link/C/c_link.h
index 12bedb21189faf5940dcc7e585f8403cf5a60d3f..abf8f1e97f3988fc39bc879fc2df31eea403f23a 100755
--- a/src/link/C/c_link.h
+++ b/src/link/C/c_link.h
@@ -14,7 +14,7 @@
 #define MAXITEMLEN		10
 #define MAXRESULTLEN    10
 #define MAXBOOLLEN		6
-#define UUIDLEN	37	// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx (8-4-4-4-12) + 1 null
+#define UUIDLEN	42	// 40 digits, 'L' and NULL
 
 /********** Type definitions **********/