diff --git a/server/event.c b/server/event.c
index d6c8fefc054..6aec64ab187 100644
--- a/server/event.c
+++ b/server/event.c
@@ -45,6 +45,7 @@ struct event
 static void event_dump( struct object *obj, int verbose );
 static int event_signaled( struct object *obj, struct thread *thread );
 static int event_satisfied( struct object *obj, struct thread *thread );
+static unsigned int event_map_access( struct object *obj, unsigned int access );
 static int event_signal( struct object *obj, unsigned int access);
 
 static const struct object_ops event_ops =
@@ -57,7 +58,7 @@ static const struct object_ops event_ops =
     event_satisfied,           /* satisfied */
     event_signal,              /* signal */
     no_get_fd,                 /* get_fd */
-    no_map_access,             /* map_access */
+    event_map_access,          /* map_access */
     no_lookup_name,            /* lookup_name */
     no_close_handle,           /* close_handle */
     no_destroy                 /* destroy */
@@ -132,6 +133,15 @@ static int event_satisfied( struct object *obj, struct thread *thread )
     return 0;  /* Not abandoned */
 }
 
+static unsigned int event_map_access( struct object *obj, unsigned int access )
+{
+    if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE | EVENT_QUERY_STATE;
+    if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE;
+    if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
+    if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL | EVENT_ALL_ACCESS;
+    return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
+}
+
 static int event_signal( struct object *obj, unsigned int access )
 {
     struct event *event = (struct event *)obj;
diff --git a/server/mutex.c b/server/mutex.c
index 0f1e9f825f2..410416133a7 100644
--- a/server/mutex.c
+++ b/server/mutex.c
@@ -47,6 +47,7 @@ struct mutex
 static void mutex_dump( struct object *obj, int verbose );
 static int mutex_signaled( struct object *obj, struct thread *thread );
 static int mutex_satisfied( struct object *obj, struct thread *thread );
+static unsigned int mutex_map_access( struct object *obj, unsigned int access );
 static void mutex_destroy( struct object *obj );
 static int mutex_signal( struct object *obj, unsigned int access );
 
@@ -60,7 +61,7 @@ static const struct object_ops mutex_ops =
     mutex_satisfied,           /* satisfied */
     mutex_signal,              /* signal */
     no_get_fd,                 /* get_fd */
-    no_map_access,             /* map_access */
+    mutex_map_access,          /* map_access */
     no_lookup_name,            /* lookup_name */
     no_close_handle,           /* close_handle */
     mutex_destroy              /* destroy */
@@ -143,6 +144,15 @@ static int mutex_satisfied( struct object *obj, struct thread *thread )
     return 1;
 }
 
+static unsigned int mutex_map_access( struct object *obj, unsigned int access )
+{
+    if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE;
+    if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | MUTEX_MODIFY_STATE;
+    if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
+    if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL | MUTEX_ALL_ACCESS;
+    return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
+}
+
 static int mutex_signal( struct object *obj, unsigned int access )
 {
     struct mutex *mutex = (struct mutex *)obj;
diff --git a/server/semaphore.c b/server/semaphore.c
index 6cc1012a035..d8188984727 100644
--- a/server/semaphore.c
+++ b/server/semaphore.c
@@ -45,6 +45,7 @@ struct semaphore
 static void semaphore_dump( struct object *obj, int verbose );
 static int semaphore_signaled( struct object *obj, struct thread *thread );
 static int semaphore_satisfied( struct object *obj, struct thread *thread );
+static unsigned int semaphore_map_access( struct object *obj, unsigned int access );
 static int semaphore_signal( struct object *obj, unsigned int access );
 
 static const struct object_ops semaphore_ops =
@@ -57,7 +58,7 @@ static const struct object_ops semaphore_ops =
     semaphore_satisfied,           /* satisfied */
     semaphore_signal,              /* signal */
     no_get_fd,                     /* get_fd */
-    no_map_access,                 /* map_access */
+    semaphore_map_access,          /* map_access */
     no_lookup_name,                /* lookup_name */
     no_close_handle,               /* close_handle */
     no_destroy                     /* destroy */
@@ -133,6 +134,15 @@ static int semaphore_satisfied( struct object *obj, struct thread *thread )
     return 0;  /* not abandoned */
 }
 
+static unsigned int semaphore_map_access( struct object *obj, unsigned int access )
+{
+    if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE;
+    if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | SEMAPHORE_MODIFY_STATE;
+    if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
+    if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL | SEMAPHORE_ALL_ACCESS;
+    return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
+}
+
 static int semaphore_signal( struct object *obj, unsigned int access )
 {
     struct semaphore *sem = (struct semaphore *)obj;
diff --git a/server/timer.c b/server/timer.c
index 7c20f19fff3..b87dd888f7f 100644
--- a/server/timer.c
+++ b/server/timer.c
@@ -53,6 +53,7 @@ struct timer
 static void timer_dump( struct object *obj, int verbose );
 static int timer_signaled( struct object *obj, struct thread *thread );
 static int timer_satisfied( struct object *obj, struct thread *thread );
+static unsigned int timer_map_access( struct object *obj, unsigned int access );
 static void timer_destroy( struct object *obj );
 
 static const struct object_ops timer_ops =
@@ -65,7 +66,7 @@ static const struct object_ops timer_ops =
     timer_satisfied,           /* satisfied */
     no_signal,                 /* signal */
     no_get_fd,                 /* get_fd */
-    no_map_access,             /* map_access */
+    timer_map_access,          /* map_access */
     no_lookup_name,            /* lookup_name */
     no_close_handle,           /* close_handle */
     timer_destroy              /* destroy */
@@ -196,6 +197,15 @@ static int timer_satisfied( struct object *obj, struct thread *thread )
     return 0;
 }
 
+static unsigned int timer_map_access( struct object *obj, unsigned int access )
+{
+    if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE | TIMER_QUERY_STATE;
+    if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | TIMER_MODIFY_STATE;
+    if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
+    if (access & GENERIC_ALL)     access |= TIMER_ALL_ACCESS;
+    return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
+}
+
 static void timer_destroy( struct object *obj )
 {
     struct timer *timer = (struct timer *)obj;