diff --git a/sau/gentoo.py b/sau/gentoo.py
index 3f94b4c..67a9ca3 100644
--- a/sau/gentoo.py
+++ b/sau/gentoo.py
@@ -24,12 +24,7 @@ def identify_service_from_bin(exe):
     ret, out, err = sau.helpers.exec_cmd(cmd)
 
     if ret != 0:
-        log.warning("searching for owner of {} failed:".format(exe))
-        for line in out.splitlines():
-            log.warning("stdout: {}".format(line))
-        for line in err.splitlines():
-            log.warning("stderr: {}".format(line))
-        return None
+        raise sau.errors.UnknownServiceError("searching for owner of {} failed:".format(exe))
     
     pkg = out.strip()
     cmd = [ EQUERY_PATH, '-Cq', 'f', pkg ]
@@ -48,9 +43,9 @@ def identify_service_from_bin(exe):
         if match:
             matches.add(match.group(1))
     if len(matches) < 1:
-        log.warning('Could not find any init script in package {}'.format(pkg))
+        raise sau.errors.UnknownServiceError('Could not find any init script in package {}'.format(pkg))
     elif len(matches) > 1:
-        log.warning('Found multiple init script in package {}'.format(pkg))
+        raise.sau.errors.UnknownServiceError('Found multiple init script in package {}'.format(pkg))
     else:
         return matches.pop()
     return None