diff --git a/src/c/threads/semaphore.d b/src/c/threads/semaphore.d
index 04078f61c..8811be3f0 100644
--- a/src/c/threads/semaphore.d
+++ b/src/c/threads/semaphore.d
@@ -79,7 +79,7 @@ mp_semaphore_wait_count(cl_object semaphore)
     }
     AO_fetch_and_add((AO_t*)&semaphore->semaphore.counter, n);
     if (semaphore->semaphore.queue_list != ECL_NIL) {
-      ecl_wakeup_waiters(env, semaphore, ECL_WAKEUP_ONE);
+      ecl_wakeup_waiters(env, semaphore, ECL_WAKEUP_ALL);
     }
     @(return);
   } @)
diff --git a/src/tests/ecl-tests.lisp b/src/tests/ecl-tests.lisp
index 97223ff82..a31c9eabd 100644
--- a/src/tests/ecl-tests.lisp
+++ b/src/tests/ecl-tests.lisp
@@ -26,7 +26,7 @@
 
 (suite 'make-check
        '(executable ieee-fp eprocess package-ext hash-tables ansi+ mixed cmp emb
-         ffi mop run-program))
+         ffi mop run-program mp ieee-fp))
 
 
 (defmacro is-true (form)