diff --git a/lcl/interfaces/gtk/gtklclintf.inc b/lcl/interfaces/gtk/gtklclintf.inc
index d61536a5bd..339dd2c5c4 100644
--- a/lcl/interfaces/gtk/gtklclintf.inc
+++ b/lcl/interfaces/gtk/gtklclintf.inc
@@ -214,9 +214,9 @@ begin
 
   Style:=GetStyle(lgsButton);
   if Horizontal then begin
-    Detail:='hpaned';
-  end else begin
     Detail:='vpaned';
+  end else begin
+    Detail:='hpaned';
   end;
 
   DCOrigin:=GetDCOffset(TDeviceContext(DC));
diff --git a/lcl/interfaces/gtk/gtkwsextctrls.pp b/lcl/interfaces/gtk/gtkwsextctrls.pp
index e311821d89..af3f8d8ef2 100644
--- a/lcl/interfaces/gtk/gtkwsextctrls.pp
+++ b/lcl/interfaces/gtk/gtkwsextctrls.pp
@@ -478,9 +478,9 @@ begin
 
   Style:=GetStyle(lgsButton);
   if ASplitter.ResizeAnchor in [akTop,akBottom] then begin
-    Detail:='hpaned';
-  end else begin
     Detail:='vpaned';
+  end else begin
+    Detail:='hpaned';
   end;
 
   DCOrigin:=GetDCOffset(DevContext);