diff --git a/preserves.nimble b/preserves.nimble
index 7363ada..7f6711d 100644
--- a/preserves.nimble
+++ b/preserves.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version = "20240206"
+version = "20240208"
 author        = "Emery Hemingway"
 description   = "data model and serialization format"
 license       = "Unlicense"
diff --git a/src/preserves/preserves_schema_nim.nim b/src/preserves/preserves_schema_nim.nim
index 5ccdf5a..a1b3dfa 100644
--- a/src/preserves/preserves_schema_nim.nim
+++ b/src/preserves/preserves_schema_nim.nim
@@ -930,10 +930,15 @@ proc collectRefImports(imports: var StringSet; loc: Location; pat: Pattern)
 
 proc collectRefImports(imports: var StringSet; loc: Location; sp: SimplePattern) =
   case sp.orKind
+  of SimplePatternKind.seqof:
+    collectRefImports(imports, loc, sp.seqof.pattern)
   of SimplePatternKind.setof:
     incl(imports, "std/sets")
+    collectRefImports(imports, loc, sp.setof.pattern)
   of SimplePatternKind.dictof:
     incl(imports, "std/tables")
+    collectRefImports(imports, loc, sp.dictof.key)
+    collectRefImports(imports, loc, sp.dictof.value)
   of SimplePatternKind.Ref:
     if sp.ref.module != @[] and sp.ref.module != loc.schemaPath:
       incl(imports, string sp.ref.module[0])