diff --git a/nle/dataset/populate_db.py b/nle/dataset/populate_db.py
index 7797d7832..b08090d89 100644
--- a/nle/dataset/populate_db.py
+++ b/nle/dataset/populate_db.py
@@ -251,35 +251,37 @@ def add_nledata_directory(path, name, filename=db.DB):
         db.create_dataset(name, root, conn=c, commit=False)
 
         # 2. For each xlogfile, read the games and take only the games that
-        #   correspond to the ttyrecs in the enclosing directory.
+        #   correspond to the ttyrecs that exist in the enclosing directory.
         for xlogfile in sorted(glob.iglob(path + "/*/*.xlogfile")):
             stem = xlogfile.replace(".xlogfile", ".*.ttyrec*.bz2")
 
-            files = list(glob.iglob(stem))
-            resets = set()
-            versions = set()
-            for f in files:
-                nameparts = f.split(".")
-                resets.add(nameparts[-3])
-                ttyrec_version = nameparts[-2].replace("ttyrec", "")
-                # NLE v0.8.1 or older generated v2 ttyrecs with the "ttyrec.bz2" suffix
-                v = int(ttyrec_version) if ttyrec_version else 2
-                versions.add(v)
-            resets = set(int(i.split(".")[-3]) for i in files)
-
+            files = set(glob.iglob(stem))
+            ttyrecnames = set(f.split("/")[-1] for f in files)
+            versions = set(f.split("ttyrec")[-1].replace(".bz2", "") for f in files)
             assert len(versions) == 1, "Cannot add ttyrecs with different versions"
             version = versions.pop()
+
+            if version == "":
+                raise AssertionError(
+                    "Ttyrec version (* in ttyrec*.bz2) must be > 1 for NLE data."
+                )
+
             c.execute(
                 "UPDATE roots SET ttyrec_version = ? WHERE dataset_name = ?",
-                (version, name),
+                (int(version), name),
             )
-            version = str(version)
+
+            ttyrecs = []
+            ttydir = str(os.path.dirname(xlogfile))
 
             def filter(gen):
                 # The `xlogfile` may have more rows than files in directory
                 # due to 'save_ttyrec_every' option in env.py, so filter these out.
-                for line_no, line in enumerate(gen):
-                    if line_no in resets:
+                # If we do find a file, we will save it to be added later.
+                for line in gen:
+                    ttyrecname = line.decode("ascii").split("ttyrecname=")[-1].strip()
+                    if ttyrecname in ttyrecnames:
+                        ttyrecs.append(ttydir + "/" + ttyrecname)
                         yield line
 
             # 3. Add games to `games` and `datasets` table.
@@ -293,12 +295,8 @@ def filter(gen):
             db.add_games(name, *gameids, conn=conn, commit=False)
 
             # 4. Add ttyrecs to `ttyrecs` table.
-            valid_resets = list(resets)[: len(gameids)]
-            ttyrecs = [
-                stem.replace("*", str(r), 1).replace("*", version, 1)
-                for r in sorted(valid_resets, reverse=True)
-            ]
-            ttyrec_gen = ttyrec_data_generator(ttyrecs, gameids, root)
+            # Note gameids are "most recently added" so must be reversed.
+            ttyrec_gen = ttyrec_data_generator(ttyrecs, reversed(gameids), root)
             c.executemany("INSERT INTO ttyrecs VALUES (?,?,?,?,?)", ttyrec_gen)
 
         mtime = time.time()