diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim
index 31b3770459d71..40da501b93792 100644
--- a/compiler/semexprs.nim
+++ b/compiler/semexprs.nim
@@ -1411,7 +1411,7 @@ proc semSym(c: PContext, n: PNode, sym: PSym, flags: TExprFlags): PNode =
     elif s.ast != nil:
       result = semExpr(c, s.ast)
     else:
-      n.typ() = s.typ
+      n.typ() = makeTypeDesc(c, s.typ)
       return n
   of skType:
     if n.kind != nkDotExpr: # dotExpr is already checked by builtinFieldAccess
diff --git a/tests/tuples/tgenericparamtypetuple.nim b/tests/tuples/tgenericparamtypetuple.nim
new file mode 100644
index 0000000000000..6701a44e781c6
--- /dev/null
+++ b/tests/tuples/tgenericparamtypetuple.nim
@@ -0,0 +1,6 @@
+# issue #25312
+
+import heapqueue
+
+proc failingTest[T](test: HeapQueue[(float, T)]) = # (Compile) Error: Mixing types and values in tuples is not allowed.
+    discard