diff --git a/doc/Changelog b/doc/Changelog
index cbcd18795..bceef7279 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,6 @@
+29 March 2018: Ralph
+	- Check "result" in dup_all(), by Florian Obser.
+
 23 March 2018: Ralph
 	- Fix unbound-control get_option aggressive-nsec
 
diff --git a/services/authzone.c b/services/authzone.c
index 13e36b2cb..fac8e4ed1 100644
--- a/services/authzone.c
+++ b/services/authzone.c
@@ -5946,7 +5946,7 @@ static char*
 dup_all(char* str)
 {
 	char* result = strdup(str);
-	if(!str) {
+	if(!result) {
 		log_err("malloc failure");
 		return NULL;
 	}