diff --git a/src/knowledge.c b/src/knowledge.c
index ff8ed79..66bde5e 100644
--- a/src/knowledge.c
+++ b/src/knowledge.c
@@ -358,7 +358,7 @@ knowledgePrintShort (const Knowledge know)
   if (know->basic != NULL)
     {
       termlistPrint (know->basic);
-      if (know->encrypt != NULL);
+      if (know->encrypt != NULL)
       {
 	eprintf (", ");
       }