diff --git a/src/tracerestrict.cpp b/src/tracerestrict.cpp
index 3bca02dbac..f6174ee648 100644
--- a/src/tracerestrict.cpp
+++ b/src/tracerestrict.cpp
@@ -972,7 +972,7 @@ CommandCost TraceRestrictProgram::Validate(const std::vector<TraceRestrictItem>
 	// static to avoid needing to re-alloc/resize on each execution
 	static std::vector<TraceRestrictCondStackFlags> condstack;
 	condstack.clear();
-	actions_used_flags = static_cast<TraceRestrictProgramActionsUsedFlags>(0);
+	actions_used_flags = TRPAUF_NONE;
 
 	static std::vector<TraceRestrictSlotID> pbs_res_end_released_slots;
 	pbs_res_end_released_slots.clear();
@@ -2301,7 +2301,7 @@ CommandCost CmdProgramSignalTraceRestrictProgMgmt(TileIndex tile, DoCommandFlag
 				prog->items = source_prog->items; // copy
 				prog->Validate();
 
-				TraceRestrictCheckRefreshSignals(prog, 0, static_cast<TraceRestrictProgramActionsUsedFlags>(0));
+				TraceRestrictCheckRefreshSignals(prog, 0, TRPAUF_NONE);
 			}
 			break;
 		}
@@ -2337,7 +2337,7 @@ CommandCost CmdProgramSignalTraceRestrictProgMgmt(TileIndex tile, DoCommandFlag
 			}
 
 			TraceRestrictCreateProgramMapping(self, source_prog);
-			TraceRestrictCheckRefreshSingleSignal(source_prog, self, static_cast<TraceRestrictProgramActionsUsedFlags>(0));
+			TraceRestrictCheckRefreshSingleSignal(source_prog, self, TRPAUF_NONE);
 			break;
 		}
 
@@ -2361,7 +2361,7 @@ CommandCost CmdProgramSignalTraceRestrictProgMgmt(TileIndex tile, DoCommandFlag
 
 				new_prog->items.swap(items);
 				new_prog->Validate();
-				TraceRestrictCheckRefreshSingleSignal(new_prog, self, static_cast<TraceRestrictProgramActionsUsedFlags>(0));
+				TraceRestrictCheckRefreshSingleSignal(new_prog, self, TRPAUF_NONE);
 			}
 			break;
 		}
diff --git a/src/tracerestrict.h b/src/tracerestrict.h
index 5577c0f09e..405349af60 100644
--- a/src/tracerestrict.h
+++ b/src/tracerestrict.h
@@ -455,6 +455,7 @@ DECLARE_ENUM_AS_BIT_SET(TraceRestrictProgramResultFlags)
  * Enumeration for TraceRestrictProgram::actions_used_flags
  */
 enum TraceRestrictProgramActionsUsedFlags {
+	TRPAUF_NONE                   = 0,       ///< No flags set
 	TRPAUF_PF                     = 1 << 0,  ///< Pathfinder deny or penalty are present
 	TRPAUF_RESERVE_THROUGH        = 1 << 1,  ///< Reserve through action is present
 	TRPAUF_LONG_RESERVE           = 1 << 2,  ///< Long reserve action is present
@@ -564,7 +565,7 @@ private:
 public:
 
 	TraceRestrictProgram()
-			: refcount(0), actions_used_flags(static_cast<TraceRestrictProgramActionsUsedFlags>(0)) { }
+			: refcount(0), actions_used_flags(TRPAUF_NONE) { }
 
 	~TraceRestrictProgram()
 	{