diff --git a/src/if_perlsfio.c b/src/if_perlsfio.c
index 528a1b4..31f0c6b 100644
--- a/src/if_perlsfio.c
+++ b/src/if_perlsfio.c
@@ -51,7 +51,7 @@
 {
     Sfdisc_t	*disc;
 
-    disc = (Sfdisc_t *)alloc((unsigned)sizeof(Sfdisc_t));
+    disc = (Sfdisc_t *)alloc(sizeof(Sfdisc_t));
     if (disc == NULL)
 	return NULL;