diff --git a/fdroidserver/scanner.py b/fdroidserver/scanner.py
index 0e877f07..88ce3236 100644
--- a/fdroidserver/scanner.py
+++ b/fdroidserver/scanner.py
@@ -33,6 +33,7 @@ from datetime import datetime, timedelta
 from enum import IntEnum
 from pathlib import Path
 from tempfile import TemporaryDirectory
+from typing import Union
 
 if sys.version_info >= (3, 11):
     import tomllib
@@ -114,7 +115,7 @@ class GradleVersionCatalog:
         """
         return alias.replace("-", ".").replace("_", ".")
 
-    def get_version(self, version: dict) -> str:
+    def get_version(self, version: Union[dict, str]) -> str:
         if isinstance(version, str):
             return version
         ref = version.get("ref")
@@ -126,8 +127,10 @@ class GradleVersionCatalog:
             or version.get("strictly", "")
         )
 
-    def library_to_coordinate(self, library: dict) -> str:
+    def library_to_coordinate(self, library: Union[dict, str]) -> str:
         """Generate the Gradle dependency coordinate from catalog."""
+        if isinstance(library, str):
+            return library
         module = library.get("module")
         if not module:
             group = library.get("group")
@@ -143,8 +146,10 @@ class GradleVersionCatalog:
         else:
             return module
 
-    def plugin_to_coordinate(self, plugin: dict) -> str:
+    def plugin_to_coordinate(self, plugin: Union[dict, str]) -> str:
         """Generate the Gradle plugin coordinate from catalog."""
+        if isinstance(plugin, str):
+            return plugin
         id = plugin.get("id")
         if not id:
             return ""
@@ -155,7 +160,7 @@ class GradleVersionCatalog:
         else:
             return id
 
-    def bundle_to_coordinates(self, bundle) -> list[str]:
+    def bundle_to_coordinates(self, bundle: list[str]) -> list[str]:
         """Generate the Gradle dependency bundle coordinate from catalog."""
         coordinates = []
         for alias in bundle:
diff --git a/tests/scanner.TestCase b/tests/scanner.TestCase
index 701c0b2e..dbb27fd7 100755
--- a/tests/scanner.TestCase
+++ b/tests/scanner.TestCase
@@ -143,6 +143,7 @@ class ScannerTest(unittest.TestCase):
             'firebase.crash': ['com.google.firebase:firebase-crash:1.1.1'],
             'firebase.core': ['com.google.firebase:firebase-core:2.2.2'],
             'play.service.ads': ['com.google.android.gms:play-services-ads:1.2.1'],
+            'jacoco': ['org.jacoco:org.jacoco.core:0.8.7'],
             'plugins.google.services': ['com.google.gms.google-services:1.2.1'],
             'plugins.firebase.crashlytics': ['com.google.firebase.crashlytics:1.1.1'],
             'bundles.firebase': [
diff --git a/tests/source-files/catalog.test/gradle/libs.versions.toml b/tests/source-files/catalog.test/gradle/libs.versions.toml
index 666a0f7f..e5327907 100644
--- a/tests/source-files/catalog.test/gradle/libs.versions.toml
+++ b/tests/source-files/catalog.test/gradle/libs.versions.toml
@@ -6,6 +6,7 @@ gms = "1.2.1"
 firebase-crash = { module = "com.google.firebase:firebase-crash", version.ref = "firebase" }
 firebase_core = { module = "com.google.firebase:firebase-core", version = "2.2.2" }
 "play.service.ads" = { module = "com.google.android.gms:play-services-ads", version.ref = "gms"}
+jacoco = "org.jacoco:org.jacoco.core:0.8.7"
 
 [plugins]
 google-services = { id = "com.google.gms.google-services", version.ref = "gms" }