diff --git a/src/Language/Haskell/TH/ReifyMany.hs b/src/Language/Haskell/TH/ReifyMany.hs
--- a/src/Language/Haskell/TH/ReifyMany.hs
+++ b/src/Language/Haskell/TH/ReifyMany.hs
@@ -111,6 +111,9 @@
 #if MIN_VERSION_template_haskell(2,7,0)
             FamilyI{} -> skip "type or data family"
 #endif
+#if MIN_VERSION_template_haskell(2,12,0)
+            PatSynI{} -> skip "pattern synonym"
+#endif
 
 -- | Starting from a set of initial top level declarations, specified
 -- by @[Name]@, recursively enumerate other related declarations.  The
diff --git a/th-reify-many.cabal b/th-reify-many.cabal
--- a/th-reify-many.cabal
+++ b/th-reify-many.cabal
@@ -1,5 +1,5 @@
 name:              th-reify-many
-version:           0.1.7
+version:           0.1.8
 synopsis:          Recurseively reify template haskell datatype info
 
 description:       @th-reify-many@ provides functions for recursively reifying top