diff --git a/easybuild/easyconfigs/p/pytorch-3dunet/pytorch-3dunet-1.6.0-foss-2022a-CUDA-11.7.0.eb b/easybuild/easyconfigs/p/pytorch-3dunet/pytorch-3dunet-1.6.0-foss-2022a-CUDA-11.7.0.eb
index 30a11ee9960..e0ca7a4f166 100644
--- a/easybuild/easyconfigs/p/pytorch-3dunet/pytorch-3dunet-1.6.0-foss-2022a-CUDA-11.7.0.eb
+++ b/easybuild/easyconfigs/p/pytorch-3dunet/pytorch-3dunet-1.6.0-foss-2022a-CUDA-11.7.0.eb
@@ -43,7 +43,7 @@ exts_list = [
     (name, version, {
         'modulename': 'pytorch3dunet',
         'source_urls': [GITHUB_SOURCE],
-        'sources': '%(version)s.tar.gz',
+        'sources': ['%(version)s.tar.gz'],
         'checksums': ['5323eb8a31ad95c17a3e3d83e3de08b0d3cdd0841b28687aa41039355706b659'],
     }),
 ]