3 files changed, 27 insertions, 5 deletions
diff --git a/src/heretic/deh_htic.c b/src/heretic/deh_htic.c
index 5a0a571e..5bd198ed 100644
--- a/src/heretic/deh_htic.c
+++ b/src/heretic/deh_htic.c
@@ -138,6 +138,24 @@ void DEH_HereticInit(void)
     }
 }
 
+int DEH_MapHereticThingType(int type)
+{
+    // Heretic 1.0 had an extra entry in the mobjinfo table that was removed
+    // in later versions. This has been added back into the table for
+    // compatibility. However, it also means that if we're loading a patch
+    // for a later version, we need to translate to the index used internally.
+
+    if (deh_hhe_version > deh_hhe_1_0)
+    {
+        if (type >= MT_PHOENIXFX_REMOVED)
+        {
+            ++type;
+        }
+    }
+
+    return type;
+}
+
 int DEH_MapHereticFrameNumber(int frame)
 {
     if (deh_hhe_version < deh_hhe_1_2)
diff --git a/src/heretic/deh_htic.h b/src/heretic/deh_htic.h
index 7855da8c..26606045 100644
--- a/src/heretic/deh_htic.h
+++ b/src/heretic/deh_htic.h
@@ -51,6 +51,7 @@ typedef enum
 #define DEH_HERETIC_NUMMOBJTYPES (NUMMOBJTYPES - 2)
 
 void DEH_HereticInit(void);
+int DEH_MapHereticThingType(int type);
 int DEH_MapHereticFrameNumber(int frame);
 void DEH_SuggestHereticVersion(deh_hhe_version_t version);
 
diff --git a/src/heretic/deh_thing.c b/src/heretic/deh_thing.c
index dbb239e4..63fd381e 100644
--- a/src/heretic/deh_thing.c
+++ b/src/heretic/deh_thing.c
@@ -66,21 +66,24 @@ DEH_END_MAPPING
 
 static void *DEH_ThingStart(deh_context_t *context, char *line)
 {
-    int thing_number = 0;
+    int orig_thing_number = 0, thing_number = 0;
     mobjinfo_t *mobj;
 
-    if (sscanf(line, "Thing %i", &thing_number) != 1)
+    if (sscanf(line, "Thing %i", &orig_thing_number) != 1)
     {
         DEH_Warning(context, "Parse error on section start");
         return NULL;
     }
 
-    // HHE thing numbers are indexed from 1
-    --thing_number;
+    // Translate to the correct thing number based on the exe version this
+    // patch was made for. Subtract one because HHE thing numbers are
+    // indexed from 1.
+
+    thing_number = DEH_MapHereticThingType(orig_thing_number - 1);
 
     if (thing_number < 0 || thing_number >= DEH_HERETIC_NUMMOBJTYPES)
     {
-        DEH_Warning(context, "Invalid thing number: %i", thing_number);
+        DEH_Warning(context, "Invalid thing number: %i", orig_thing_number);
         return NULL;
     }