diff --git a/src/capability.c b/src/capability.c
index 9906db0d..f44b0a75 100644
--- a/src/capability.c
+++ b/src/capability.c
@@ -159,7 +159,7 @@ capability_index_list(struct CapabilityIndex *idx, unsigned int cap_mask)
 
 	DICTIONARY_FOREACH(entry, &iter, idx->cap_dict)
 	{
-		if (entry->value & cap_mask)
+		if ((1 << entry->value) & cap_mask)
 		{
 			tl = rb_sprintf(t, "%s ", entry->cap);
 			t += tl;