diff --git a/src/script/hydra-eval-jobset b/src/script/hydra-eval-jobset
index 56aa1c55..7a8a4abe 100755
--- a/src/script/hydra-eval-jobset
+++ b/src/script/hydra-eval-jobset
@@ -382,7 +382,7 @@ sub evalJobs {
     push @cmd, "--meta";
     push @cmd, "--constituents";
     push @cmd, "--force-recurse";
-    push @cmd, ("--option", "allow-import-from-derivation", "false") if $config->{allow_import_from_derivation} // "true" ne "true";
+    push @cmd, ("--option", "allow-import-from-derivation", "false") if ($config->{allow_import_from_derivation} // "true") ne "true";
     push @cmd, ("--workers", $config->{evaluator_workers} // 1);
     push @cmd, ("--max-memory-size", $config->{evaluator_max_memory_size} // 4096);