diff --git a/src/xspice/icm/digital/d_source/cfunc.mod b/src/xspice/icm/digital/d_source/cfunc.mod
index a9c866c2a..7540ff5d7 100644
--- a/src/xspice/icm/digital/d_source/cfunc.mod
+++ b/src/xspice/icm/digital/d_source/cfunc.mod
@@ -61,7 +61,7 @@ NON-STANDARD FEATURES
 
 /*=== CONSTANTS ========================*/
 
-#define MAX_STRING_SIZE 200
+#define MAX_STRING_SIZE 1024
 
 
 /*=== MACROS ===========================*/