diff --git a/swh/lister/nixguix/lister.py b/swh/lister/nixguix/lister.py
--- a/swh/lister/nixguix/lister.py
+++ b/swh/lister/nixguix/lister.py
@@ -16,6 +16,7 @@
 """
 
 import base64
+import binascii
 from dataclasses import dataclass
 from enum import Enum
 import logging
@@ -362,11 +363,20 @@
                     yield built_artifact
                     continue
 
+                outputHash = artifact.get("outputHash")
                 integrity = artifact.get("integrity")
-                if integrity is None:
-                    logger.warning("Skipping url <%s>: missing integrity field", origin)
+                if integrity is None and outputHash is None:
+                    logger.warning(
+                        "Skipping url <%s>: missing integrity and outputHash field",
+                        origin,
+                    )
                     continue
 
+                # Falls back to outputHash field if integrity is missing
+                if integrity is None and outputHash:
+                    # We'll deal with outputHash as integrity field
+                    integrity = outputHash
+
                 try:
                     is_tar, origin = is_tarball(urls, self.session)
                 except ArtifactNatureMistyped:
@@ -396,10 +406,18 @@
                 # convert into a dict of checksums. This only parses the
                 # `hash-expression` (hash-<b64-encoded-checksum>) as defined in
                 # https://w3c.github.io/webappsec-subresource-integrity/#the-integrity-attribute
-                chksum_algo, chksum_b64 = integrity.split("-")
-                checksums: Dict[str, str] = {
-                    chksum_algo: base64.decodebytes(chksum_b64.encode()).hex()
-                }
+                try:
+                    chksum_algo, chksum_b64 = integrity.split("-")
+                    checksums: Dict[str, str] = {
+                        chksum_algo: base64.decodebytes(chksum_b64.encode()).hex()
+                    }
+                except binascii.Error:
+                    logger.exception(
+                        "Skipping url: <%s>: integrity computation failure for <%s>",
+                        url,
+                        artifact,
+                    )
+                    continue
 
                 # The 'outputHashMode' attribute determines how the hash is computed. It
                 # must be one of the following two values:
diff --git a/swh/lister/nixguix/tests/data/guix-swh_sources.json b/swh/lister/nixguix/tests/data/guix-swh_sources.json
--- a/swh/lister/nixguix/tests/data/guix-swh_sources.json
+++ b/swh/lister/nixguix/tests/data/guix-swh_sources.json
@@ -27,6 +27,16 @@
       ],
       "integrity": "sha256-lV3xiWUZmSnt4LW0ni/sUyC/bbtaxkTzvFLFtJKLuI4="
     },
+    {
+      "outputHash": "sha256-9uF0fYl4Zz/Ia2UKx7CBi8ZU8jfWoBfy2QSgTSwXo5A",
+      "outputHashAlgo": null,
+      "outputHashMode": "recursive",
+      "type": "url",
+      "urls": [
+        "https://github.com/figiel/hosts/archive/v1.0.0.tar.gz"
+      ],
+      "inferredFetcher": "fetchzip"
+    },
     {
       "type": "url",
       "urls": [ "unknown://example.org/wrong-scheme-so-skipped.txt" ],
diff --git a/swh/lister/nixguix/tests/data/nixpkgs-swh_sources.json b/swh/lister/nixguix/tests/data/nixpkgs-swh_sources.json
--- a/swh/lister/nixguix/tests/data/nixpkgs-swh_sources.json
+++ b/swh/lister/nixguix/tests/data/nixpkgs-swh_sources.json
@@ -79,6 +79,16 @@
       "svn_url": "https://code.call-cc.org/svn/chicken-eggs/release/5/iset/tags/2.2",
       "svn_revision": 39057
     },
+    {
+      "outputHash": "sha256-LxVcYj2WKHbhNu5x/DFkxQPOYrVkNvwiE/qcODq52Lc=",
+      "outputHashAlgo": null,
+      "outputHashMode": "recursive",
+      "type": "url",
+      "urls": [
+        "https://github.com/julian-klode/triehash/archive/debian/0.3-3.tar.gz"
+      ],
+      "inferredFetcher": "fetchzip"
+    },
     {
       "type": "url",
       "urls": [