diff --git a/.waf-tools/pch.py b/.waf-tools/pch.py
index 3df299f..57582ad 100644
--- a/.waf-tools/pch.py
+++ b/.waf-tools/pch.py
@@ -95,8 +95,8 @@
 
 	if getattr(self, 'name', None):
 		try:
-			task = self.bld.pch_tasks[self.name]
-			self.bld.fatal("Duplicated 'pch' task with name %r" % self.name)
+			task = self.bld.pch_tasks["%s.%s" % (self.name, self.idx)]
+			self.bld.fatal("Duplicated 'pch' task with name %r" % "%s.%s" % (self.name, self.idx))
 		except KeyError:
 			pass
 
@@ -109,7 +109,7 @@
 
 	self.pch_task = task
 	if getattr(self, 'name', None):
-		self.bld.pch_tasks[self.name] = task
+		self.bld.pch_tasks["%s.%s" % (self.name, self.idx)] = task
 
 @TaskGen.feature('cxx')
 @TaskGen.after_method('process_source', 'propagate_uselib_vars')