diff --git a/.gitattributes b/.gitattributes
index 0e12e163cd..eeab6334d2 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -13938,6 +13938,7 @@ tests/webtbs/tw25956.pp svneol=native#text/pascal
 tests/webtbs/tw25959.pp svneol=native#text/pascal
 tests/webtbs/tw2602.pp svneol=native#text/plain
 tests/webtbs/tw2607.pp svneol=native#text/plain
+tests/webtbs/tw26123.pp svneol=native#text/pascal
 tests/webtbs/tw26162.pp svneol=native#text/pascal
 tests/webtbs/tw26180.pp svneol=native#text/pascal
 tests/webtbs/tw2620.pp svneol=native#text/plain
diff --git a/compiler/pdecobj.pas b/compiler/pdecobj.pas
index a546d25ea7..3e8c21cffb 100644
--- a/compiler/pdecobj.pas
+++ b/compiler/pdecobj.pas
@@ -1397,9 +1397,9 @@ implementation
 
         { usage of specialized type inside its generic template }
         if assigned(genericdef) then
-          current_specializedef:=current_structdef
+          current_specializedef:=current_structdef;
         { reject declaration of generic class inside generic class }
-        else if assigned(genericlist) then
+        if assigned(genericlist) then
           current_genericdef:=current_structdef;
 
         { nested types of specializations are specializations as well }
diff --git a/tests/webtbs/tw26123.pp b/tests/webtbs/tw26123.pp
new file mode 100644
index 0000000000..1ef7babac0
--- /dev/null
+++ b/tests/webtbs/tw26123.pp
@@ -0,0 +1,25 @@
+{ %NORUN }
+
+program tw26123;
+
+{$mode objfpc}
+
+type
+    generic TNode<data_type> = class // anything can go in this class
+    end;
+
+    generic TLinkedList<data_type> = class
+      type
+          specialized_TNode = specialize TNode<data_type>;
+      public
+        node : specialized_TNode;
+    end;
+
+
+    generic TExtendedLinkedList<data_type> = class (specialize TLinkedList<data_type>)
+      public
+        last_node : specialized_TNode;
+    end;
+
+begin
+end.