diff --git a/src/quickfix.c b/src/quickfix.c
index db4c0fa..7b6d1bc 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -675,7 +675,7 @@
 		    if (fgets((char *)growbuf + growbuflen,
 					 growbufsiz - growbuflen, fd) == NULL)
 			break;
-		    linelen = STRLEN(growbuf + growbuflen);
+		    linelen = (int)STRLEN(growbuf + growbuflen);
 		    growbuflen += linelen;
 		    if (growbuf[growbuflen - 1] == '\n'
 #ifdef USE_CRNL