diff --git a/config/rules.mk b/config/rules.mk
index 5f122b809874..a742374f23f7 100644
--- a/config/rules.mk
+++ b/config/rules.mk
@@ -1216,17 +1216,10 @@ else
 endif
 endif
 
-# Cancel these implicit rules
-#
-%: %,v
-
-%: RCS/%,v
-
-%: RCS/%
-
-%: s.%
-
-%: SCCS/s.%
+# Cancel GNU make built-in implicit rules
+ifndef .PYMAKE
+MAKEFLAGS += -r
+endif
 
 ###############################################################################
 # Java rules
diff --git a/js/src/config/rules.mk b/js/src/config/rules.mk
index 5f122b809874..a742374f23f7 100644
--- a/js/src/config/rules.mk
+++ b/js/src/config/rules.mk
@@ -1216,17 +1216,10 @@ else
 endif
 endif
 
-# Cancel these implicit rules
-#
-%: %,v
-
-%: RCS/%,v
-
-%: RCS/%
-
-%: s.%
-
-%: SCCS/s.%
+# Cancel GNU make built-in implicit rules
+ifndef .PYMAKE
+MAKEFLAGS += -r
+endif
 
 ###############################################################################
 # Java rules