diff --git a/calma/CalmaWrite.c b/calma/CalmaWrite.c
index b90c6d6f..6809b98d 100644
--- a/calma/CalmaWrite.c
+++ b/calma/CalmaWrite.c
@@ -430,7 +430,7 @@ calmaDumpStructure(def, outf, calmaDefHash, filename)
     HashTable *calmaDefHash;
     char *filename;
 {
-    int nbytes, rtype;
+    int nbytes = -1, rtype = 0;
     char *strname = NULL, *newnameptr;
     HashEntry *he, *he2;
     CellDef *edef;