diff --git a/waflib/Build.py b/waflib/Build.py
index 23db1df9..f98a51ba 100644
--- a/waflib/Build.py
+++ b/waflib/Build.py
@@ -1251,22 +1251,6 @@ class UninstallContext(InstallContext):
 		super(UninstallContext, self).__init__(**kw)
 		self.is_install = UNINSTALL
 
-	def execute(self):
-		"""
-		See :py:func:`waflib.Build.BuildContext.execute`.
-		"""
-		# TODO just mark the tasks are already run with hasrun=Task.SKIPPED?
-		try:
-			# do not execute any tasks
-			def runnable_status(self):
-				return Task.SKIP_ME
-			setattr(Task.Task, 'runnable_status_back', Task.Task.runnable_status)
-			setattr(Task.Task, 'runnable_status', runnable_status)
-
-			super(UninstallContext, self).execute()
-		finally:
-			setattr(Task.Task, 'runnable_status', Task.Task.runnable_status_back)
-
 class CleanContext(BuildContext):
 	'''cleans the project'''
 	cmd = 'clean'
diff --git a/waflib/Task.py b/waflib/Task.py
index a62c32b6..58e5fbb1 100644
--- a/waflib/Task.py
+++ b/waflib/Task.py
@@ -656,6 +656,10 @@ class Task(TaskBase):
 		"""
 		See :py:meth:`waflib.Task.TaskBase.runnable_status`
 		"""
+		bld = self.generator.bld
+		if bld.is_install < 0:
+			return SKIP_ME
+
 		for t in self.run_after:
 			if not t.hasrun:
 				return ASK_LATER
@@ -670,7 +674,6 @@ class Task(TaskBase):
 			return ASK_LATER
 
 		# compare the signature to a signature computed previously
-		bld = self.generator.bld
 		key = self.uid()
 		try:
 			prev_sig = bld.task_sigs[key]