diff --git a/compiler/characterizer/delay.py b/compiler/characterizer/delay.py
index d92e97fa..7e210acd 100644
--- a/compiler/characterizer/delay.py
+++ b/compiler/characterizer/delay.py
@@ -272,11 +272,15 @@ class delay():
             self.sf.write(".end\n")
             self.sf.close()
         else:
-            self.sf.write(".control\n")
-            self.sf.write("run\n")
-            self.sf.write("quit\n")
-            self.sf.write(".endc\n")
-            self.sf.write(".end\n")
+            pass
+            # This is only needed for ngspice <26
+            # self.sf.write(".control\n")
+            # self.sf.write("run\n")
+            # self.sf.write("quit\n")
+            # self.sf.write(".endc\n")
+
+        # end the stimulus file
+        self.sf.write(".end\n")