diff --git a/compiler/types.nim b/compiler/types.nim
index a87f9470fa..5fbab85b93 100644
--- a/compiler/types.nim
+++ b/compiler/types.nim
@@ -803,6 +803,8 @@ proc sameTuple(a, b: PType, c: var TSameTypeClosure): bool =
           result = x.name.id == y.name.id
           if not result: break
         else: internalError(a.n.info, "sameTuple")
+    elif a.n != b.n and (a.n == nil or b.n == nil) and IgnoreTupleFields notin c.flags:
+      result = false
 
 template ifFastObjectTypeCheckFailed(a, b: PType, body: stmt) {.immediate.} =
   if tfFromGeneric notin a.flags + b.flags:
diff --git a/tests/tuples/twrong_generic_caching.nim b/tests/tuples/twrong_generic_caching.nim
new file mode 100644
index 0000000000..32ef344d22
--- /dev/null
+++ b/tests/tuples/twrong_generic_caching.nim
@@ -0,0 +1,4 @@
+
+import parsecfg
+
+import asynchttpserver