diff --git a/addons/51degrees/51d.c b/addons/51degrees/51d.c
index 5642e9ed9..be2dc61bd 100644
--- a/addons/51degrees/51d.c
+++ b/addons/51degrees/51d.c
@@ -1062,7 +1062,7 @@ static int init_51degrees(void)
 
 static void deinit_51degrees(void)
 {
-	struct _51d_property_names *_51d_prop_name, *_51d_prop_nameb;
+	struct _51d_property_names *_51d_prop_name = NULL, *_51d_prop_nameb = NULL;
 
 #if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED) || defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
 	free(global_51degrees.header_names);