diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index e3a175196c..90d8c19242 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -17,6 +17,7 @@
 - Change: [#24418] Small & Large Zero G Rolls can now be built on the LIM Launched RC without cheats if vehicle sprites are available.
 - Fix: [#5269] Font bugs when using the Russian release of RCT2 as the base game.
 - Fix: [#11071, #22958] The virtual floor does not always draw correctly.
+- Fix: [#18220] Some custom RCT1 scenarios are detected as competition DLC scenarios.
 - Fix: [#20158] Custom animated scenery .DATs with frame offsets draw a random sprite at the end of their animation.
 - Fix: [#23289] Dodgems and Flying Saucer cars can spawn on top of each other when the ride is opened.
 - Fix: [#24332] Banner font renders differently when using RCT Classic as the base game.
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index e9b45383e9..f64053999c 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -233,6 +233,10 @@ namespace OpenRCT2::RCT1
             // If no entry is found, this is a custom scenario.
             bool isOfficial = ScenarioSources::TryGetById(_s4.ScenarioSlotIndex, &desc);
 
+            // Perform an additional name check if this is detected to be a competition scenario
+            if (isOfficial && desc.category == ScenarioCategory::competitions)
+                isOfficial = ScenarioSources::TryGetByName(_s4.ScenarioName, &desc);
+
             dst->Category = desc.category;
             dst->SourceGame = ScenarioSource{ desc.source };
             dst->SourceIndex = desc.index;
diff --git a/src/openrct2/scenario/ScenarioSources.cpp b/src/openrct2/scenario/ScenarioSources.cpp
index 67f2309810..c71b47014c 100644
--- a/src/openrct2/scenario/ScenarioSources.cpp
+++ b/src/openrct2/scenario/ScenarioSources.cpp
@@ -334,7 +334,7 @@ namespace OpenRCT2::ScenarioSources
         { SC_MINE_TRAIN_COMPETITION,                    "Mine Train Roller Coaster Competition",      ScenarioCategory::competitions,   {}                                                            },
         { SC_STAND_UP_STEEL_ROLLER_COASTER_COMPETITION, "Stand-Up Steel Roller Coaster Competition",  ScenarioCategory::competitions,   {}                                                            },
         { SC_STEEL_CORKSCREW_COMPETITION,               "Steel Corkscrew Roller Coaster Competition", ScenarioCategory::competitions,   {}                                                            },
-        { SC_STEEL_MINI_ROLLER_COASTER_COMPETITION,     "Steel Mini Roller Coaster Competition",      ScenarioCategory::competitions,   {}                                                            },
+        { SC_STEEL_MINI_ROLLER_COASTER_COMPETITION,     "Steel Mini-Roller Coaster Competition",      ScenarioCategory::competitions,   {}                                                            },
         { SC_STEEL_ROLLER_COASTER_COMPETITION,          "Steel Roller Coaster Competition",           ScenarioCategory::competitions,   {}                                                            },
         { SC_STEEL_TWISTER_COMPETITION,                 "Steel Twister Roller Coaster Competition",   ScenarioCategory::competitions,   {}                                                            },
         { SC_SUSPENDED_ROLLER_COASTER_COMPETITION,      "Suspended Roller Coaster Competition",       ScenarioCategory::competitions,   {}                                                            },