diff --git a/sal/osl/unx/system.hxx b/sal/osl/unx/system.hxx
index 3013e91c6341..75c3d9d90d36 100644
--- a/sal/osl/unx/system.hxx
+++ b/sal/osl/unx/system.hxx
@@ -309,9 +309,12 @@ int macxp_resolveAlias(char *path, int buflen);
 #   define  INIT_GROUPS(name, gid)  ((setgid((gid)) == 0) && (initgroups((name), (gid)) == 0))
 #endif
 
-#ifndef PTHREAD_VALUE
-#   define PTHREAD_VALUE(t)             (t)
+#if defined MACOSX
+#define PTHREAD_VALUE(t) reinterpret_cast<unsigned long>(t)
+#else
+#define PTHREAD_VALUE(t) (t)
 #endif
+
 #ifndef PTHREAD_NONE
 #   define PTHREAD_NONE                 _pthread_none_
 #   ifndef PTHREAD_NONE_INIT
diff --git a/sal/osl/unx/thread.cxx b/sal/osl/unx/thread.cxx
index 2dc913c3c554..0ca411383c27 100644
--- a/sal/osl/unx/thread.cxx
+++ b/sal/osl/unx/thread.cxx
@@ -551,7 +551,7 @@ void SAL_CALL osl_setThreadName(char const * name) {
 /* osl_getThreadIdentifier @@@ see TODO @@@ */
 /*****************************************************************************/
 
-#define HASHID(x) (reinterpret_cast<unsigned long>(PTHREAD_VALUE(x)) % HashSize)
+#define HASHID(x) ((unsigned long)PTHREAD_VALUE(x) % HashSize)
 
 typedef struct _HashEntry
 {