diff --git a/contrib/sendmail/src/sasl.c b/contrib/sendmail/src/sasl.c
index 6f9e4a50df99..c3f561d9a5dd 100644
--- a/contrib/sendmail/src/sasl.c
+++ b/contrib/sendmail/src/sasl.c
@@ -24,9 +24,15 @@ SM_RCSID("@(#)$Id: sasl.c,v 8.22 2006/08/15 23:24:57 ca Exp $")
 **  using unsigned long: for portability, it should be size_t.
 */
 
-void *sm_sasl_malloc __P((unsigned long));
-static void *sm_sasl_calloc __P((unsigned long, unsigned long));
-static void *sm_sasl_realloc __P((void *, unsigned long));
+#if defined(SASL_VERSION_FULL) && SASL_VERSION_FULL >= 0x02011a
+#define SM_SASL_SIZE_T	size_t
+#else /* defined(SASL_VERSION_FULL) && SASL_VERSION_FULL >= 0x02011a */
+#define SM_SASL_SIZE_T	unsigned long
+#endif /* defined(SASL_VERSION_FULL) && SASL_VERSION_FULL >= 0x02011a */
+
+void *sm_sasl_malloc __P((SM_SASL_SIZE_T));
+static void *sm_sasl_calloc __P((SM_SASL_SIZE_T, SM_SASL_SIZE_T));
+static void *sm_sasl_realloc __P((void *, SM_SASL_SIZE_T));
 void sm_sasl_free __P((void *));
 
 /*
@@ -50,7 +56,7 @@ void sm_sasl_free __P((void *));
 
 void *
 sm_sasl_malloc(size)
-	unsigned long size;
+	SM_SASL_SIZE_T size;
 {
 	return sm_malloc((size_t) size);
 }
@@ -71,8 +77,8 @@ sm_sasl_malloc(size)
 
 static void *
 sm_sasl_calloc(nelem, elemsize)
-	unsigned long nelem;
-	unsigned long elemsize;
+	SM_SASL_SIZE_T nelem;
+	SM_SASL_SIZE_T elemsize;
 {
 	size_t size;
 	void *p;
@@ -99,7 +105,7 @@ sm_sasl_calloc(nelem, elemsize)
 static void *
 sm_sasl_realloc(o, size)
 	void *o;
-	unsigned long size;
+	SM_SASL_SIZE_T size;
 {
 	return sm_realloc(o, (size_t) size);
 }