diff --git a/vdc.c b/vdc.c
index 371f1e4..dcd2bc3 100644
--- a/vdc.c
+++ b/vdc.c
@@ -80,7 +80,7 @@
     for (i = 1; i < argc; i++) {
         char *cmp;
 
-        if (!index(argv[i], ' '))
+        if (!strchr(argv[i], ' '))
             asprintf(&cmp, "%s%s", argv[i], (i == (argc -1)) ? "" : " ");
         else
             asprintf(&cmp, "\"%s\"%s", argv[i], (i == (argc -1)) ? "" : " ");