diff --git a/Source/diablo.cpp b/Source/diablo.cpp
index b7852caa7..85955764c 100644
--- a/Source/diablo.cpp
+++ b/Source/diablo.cpp
@@ -101,9 +101,6 @@ std::array<Keymapper::ActionIndex, 4> quickSpellActionIndexes;
 
 bool gbForceWindowed = false;
 #ifdef _DEBUG
-bool monstdebug = false;
-_monster_id DebugMonsters[10];
-int debugmonsttypes = 0;
 bool debug_mode_key_inverted_v = false;
 bool debug_mode_key_i = false;
 std::vector<std::string> DebugCmdsFromCommandLine;
@@ -817,7 +814,6 @@ void RunGameLoop(interface_mode uMsg)
 	printInConsole("\nDebug options:\n");
 	printInConsole("    %-20s %-30s\n", "-^", "Enable debug tools");
 	printInConsole("    %-20s %-30s\n", "-i", "Ignore network timeout");
-	printInConsole("    %-20s %-30s\n", "-m <##>", "Add debug monster, up to 10 allowed");
 	printInConsole("    %-20s %-30s\n", "+<internal command>", "Pass commands to the engine");
 #endif
 	printInConsole("%s", _("\nReport bugs at https://github.com/diasurgical/devilutionX/\n"));
@@ -879,9 +875,6 @@ void DiabloParseFlags(int argc, char **argv)
 			debug_mode_key_inverted_v = true;
 		} else if (strcasecmp("-i", argv[i]) == 0) {
 			debug_mode_key_i = true;
-		} else if (strcasecmp("-m", argv[i]) == 0) {
-			monstdebug = true;
-			DebugMonsters[debugmonsttypes++] = (_monster_id)SDL_atoi(argv[++i]);
 		} else if (argv[i][0] == '+') {
 			if (!currentCommand.empty())
 				DebugCmdsFromCommandLine.push_back(currentCommand);
diff --git a/Source/diablo.h b/Source/diablo.h
index cf62d8d54..59e010962 100644
--- a/Source/diablo.h
+++ b/Source/diablo.h
@@ -106,9 +106,6 @@ void diablo_color_cyc_logic();
 extern Keymapper keymapper;
 extern bool gbForceWindowed;
 #ifdef _DEBUG
-extern bool monstdebug;
-extern _monster_id DebugMonsters[10];
-extern int debugmonsttypes;
 extern bool debug_mode_key_inverted_v;
 extern bool debug_mode_key_i;
 #endif
diff --git a/Source/monster.cpp b/Source/monster.cpp
index a747e37c1..9fa6676ff 100644
--- a/Source/monster.cpp
+++ b/Source/monster.cpp
@@ -3642,29 +3642,20 @@ void GetLevelMTypes()
 			}
 		}
 
-#ifdef _DEBUG
-		if (monstdebug) {
-			for (int i = 0; i < debugmonsttypes; i++)
-				AddMonsterType(DebugMonsters[i], PLACE_SCATTER);
-		} else
-#endif
-		{
-
-			while (nt > 0 && LevelMonsterTypeCount < MAX_LVLMTYPES && monstimgtot < 4000) {
-				for (int i = 0; i < nt;) {
-					if (MonstersData[typelist[i]].mImage > 4000 - monstimgtot) {
-						typelist[i] = typelist[--nt];
-						continue;
-					}
-
-					i++;
-				}
-
-				if (nt != 0) {
-					int i = GenerateRnd(nt);
-					AddMonsterType(typelist[i], PLACE_SCATTER);
+		while (nt > 0 && LevelMonsterTypeCount < MAX_LVLMTYPES && monstimgtot < 4000) {
+			for (int i = 0; i < nt;) {
+				if (MonstersData[typelist[i]].mImage > 4000 - monstimgtot) {
 					typelist[i] = typelist[--nt];
+					continue;
 				}
+
+				i++;
+			}
+
+			if (nt != 0) {
+				int i = GenerateRnd(nt);
+				AddMonsterType(typelist[i], PLACE_SCATTER);
+				typelist[i] = typelist[--nt];
 			}
 		}