diff --git a/9unit.c b/9unit.c
index e75d7ba..d9b2da6 100644
--- a/9unit.c
+++ b/9unit.c
@@ -166,7 +166,7 @@ reindex(TestState *s)
 static void
 report(const char *str)
 {
-	print(str);
+	print("%s", str);
 }
 
 //jl