diff --git a/checks.c b/checks.c
index 8b1c604..fb9cf50 100644
--- a/checks.c
+++ b/checks.c
@@ -114,6 +114,7 @@ static inline void  PRINTF(5, 6) check_msg(struct check *c, struct dt_info *dti,
 	}
 
 	fputs(str, stderr);
+	free(str);
 }
 
 #define FAIL(c, dti, node, ...)						\