diff --git a/vulnerabilities/importers/gentoo.py b/vulnerabilities/importers/gentoo.py
index 2f569cdf1..a130b5831 100644
--- a/vulnerabilities/importers/gentoo.py
+++ b/vulnerabilities/importers/gentoo.py
@@ -104,11 +104,15 @@ def affected_and_safe_purls(affected_elem):
             safe_versions, affected_versions = GentooImporter.get_safe_and_affected_versions(pkg)
 
             for version in safe_versions:
+                # version can have a slot, which we don't support in univers
+                version = version.split(":")[0]
                 constraints.append(
                     VersionConstraint(version=GentooVersion(version), comparator="=").invert()
                 )
 
             for version in affected_versions:
+                # version can have a slot, which we don't support in univers
+                version = version.split(":")[0]
                 constraints.append(
                     VersionConstraint(version=GentooVersion(version), comparator="=")
                 )