diff --git a/Library/Homebrew/requirements/conflict_requirement.rb b/Library/Homebrew/requirements/conflict_requirement.rb
index 66cdc11312..286396735c 100644
--- a/Library/Homebrew/requirements/conflict_requirement.rb
+++ b/Library/Homebrew/requirements/conflict_requirement.rb
@@ -11,7 +11,7 @@ class ConflictRequirement < Requirement
     @formula = formula
     @name = name
     @opts = opts
-    super(formula)
+    super([formula])
   end
 
   def message