diff --git a/master.cfg b/master.cfg
index 4f65fb8..aee7d42 100644
--- a/master.cfg
+++ b/master.cfg
@@ -367,8 +367,9 @@ The parameters of the class are:
       check", when testing.  Should be a dictionary (i.e., {}).  The
       default is None.
 
-    - no_test_parallel: set to True if the test shall not be
-      parallelized.  Default is False.
+    - test_parallel: set to True if the test shall be parallelized.
+      Default is False.  Beware that parallelizing tests may cause
+      some failures due to limited system resources.
 
     - use_system_debuginfo: set to False if GDB should be compiled
       with the "--with-separate-debug-dir" option set to
@@ -386,7 +387,7 @@ The parameters of the class are:
 
     # Set this to false to disable parallel testing (i.e., do not use
     # FORCE_PARALLEL)
-    no_test_parallel = False
+    test_parallel = False
 
     # Set this to False to disable using system's debuginfo files
     # (i.e., do not use '--with-separate-debug-dir')
@@ -422,7 +423,7 @@ The parameters of the class are:
         if not self.test_env:
             self.test_env = {}
 
-        if not self.no_test_parallel:
+        if self.test_parallel:
             self.extra_make_check_flags.append (WithProperties ("-j%s", 'jobs'))
             self.extra_make_check_flags.append ('FORCE_PARALLEL=1')