diff --git a/Library/Homebrew/keg_relocate.rb b/Library/Homebrew/keg_relocate.rb
index 47479d35d3..e9838640f5 100644
--- a/Library/Homebrew/keg_relocate.rb
+++ b/Library/Homebrew/keg_relocate.rb
@@ -74,13 +74,16 @@ class Keg
       s = first.open("rb", &:read)
 
       replacements = {
-        relocation.old_prefix  => relocation.new_prefix,
-        relocation.old_cellar  => relocation.new_cellar,
-        relocation.old_library => relocation.new_library,
+        relocation.old_prefix => relocation.new_prefix,
+        relocation.old_cellar => relocation.new_cellar,
       }
       # when HOMEBREW_PREFIX == HOMEBREW_REPOSITORY we should use HOMEBREW_PREFIX for all relocations to avoid
       # being unable to differentiate between them.
-      replacements[relocation.old_repository] = relocation.new_repository if HOMEBREW_PREFIX != HOMEBREW_REPOSITORY
+      if HOMEBREW_PREFIX == HOMEBREW_REPOSITORY
+        replacements[relocation.old_library] = relocation.new_library
+      else
+        replacements[relocation.old_repository] = relocation.new_repository
+      end
       changed = s.gsub!(Regexp.union(replacements.keys.sort_by(&:length).reverse), replacements)
       next unless changed