diff --git a/include/epanet2.cs b/include/epanet2.cs
index 3f40b4c..bb82d0b 100644
--- a/include/epanet2.cs
+++ b/include/epanet2.cs
@@ -665,7 +665,7 @@ namespace EpanetCSharpLibrary
         public static extern int ENsetcontrol(int index, int type, int linkIndex, float setting, int nodeIndex, float level);
 
         [DllImport(EPANETDLL, EntryPoint = "ENgetcontrolenabled")]
-        public static extern int ENgetcontrolenabled(int index, int out_enabled);
+        public static extern int ENgetcontrolenabled(int index, ref int out_enabled);
 
         [DllImport(EPANETDLL, EntryPoint = "ENsetcontrolenabled")]
         public static extern int ENsetcontrolenabled(int index, int enabled);
@@ -715,7 +715,7 @@ namespace EpanetCSharpLibrary
         public static extern int ENsetelseaction(int ruleIndex, int actionIndex, int linkIndex, int status, float setting);
 
         [DllImport(EPANETDLL, EntryPoint = "ENgetruleenabled")]
-        public static extern int ENgetruleenabled(int index, int out_enabled);
+        public static extern int ENgetruleenabled(int index, ref int out_enabled);
 
         [DllImport(EPANETDLL, EntryPoint = "ENsetruleenabled")]
         public static extern int ENsetruleenabled(int index, int enabled);
diff --git a/include/epanet2.pas b/include/epanet2.pas
index 45e6a5d..3f5d09c 100644
--- a/include/epanet2.pas
+++ b/include/epanet2.pas
@@ -450,8 +450,8 @@ const
  function  ENdeletecontrol(Index: Integer): Integer; cdecl; external EpanetLib;
  function  ENgetcontrol(Index: Integer; var Ctype: Integer; var Link: Integer; var Setting: Single; var Node: Integer; var Level: Single): Integer; cdecl; external EpanetLib;
  function  ENsetcontrol(Index: Integer; Ctype: Integer; Link: Integer; Setting: Single; Node: Integer; Level: Single): Integer; cdecl; external EpanetLib;
- function  ENgetcontrolenabled(Index: Integer; out_enabled: Integer): Integer; cdecl; external EpanetLib;
- function  ENsetcontrolenabled(Index: Integer; var enabled: Integer): Integer; cdecl; external EpanetLib;
+ function  ENgetcontrolenabled(Index: Integer; var out_enabled: Integer): Integer; cdecl; external EpanetLib;
+ function  ENsetcontrolenabled(Index: Integer; enabled: Integer): Integer; cdecl; external EpanetLib;
 
  {Rule-Based Control Functions}
  function ENaddrule(Rule: PAnsiChar): Integer; cdecl; external EpanetLib;
@@ -476,7 +476,7 @@ const
           var Status: Integer; var Setting: Single): Integer; cdecl; external EpanetLib;
  function ENsetelseaction(RuleIndex: Integer; ActionIndex: Integer; LinkIndex: Integer;
           Status: Integer; Setting: Single): Integer; cdecl; external EpanetLib;
- function  ENgetruleenabled(Index: Integer; var enabled: Integer): Integer; cdecl; external EpanetLib;
+ function  ENgetruleenabled(Index: Integer; var out_enabled: Integer): Integer; cdecl; external EpanetLib;
  function  ENsetruleenabled(Index: Integer; enabled: Integer): Integer; cdecl; external EpanetLib;
 
 implementation