diff --git a/src/utils.c b/src/utils.c
index 8623d8b..a8e4e95 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -277,7 +277,7 @@ void string_destroy_notify(gpointer str) {
 
 
 guint hash_ipv4(gconstpointer key) {
-	return GPOINTER_TO_UINT(key);
+	return *((guint*)key);
 }
 
 guint hash_ipv6(gconstpointer key) {
diff --git a/src/utils.h b/src/utils.h
index 74466ab..2c71dbb 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -26,7 +26,9 @@ LI_API gchar *ev_backend_string(guint backend);
 
 LI_API void string_destroy_notify(gpointer str);
 
+/* expects a pointer to a 32bit value */
 LI_API guint hash_ipv4(gconstpointer key);
+/* expects a pointer to a 128bit value */
 LI_API guint hash_ipv6(gconstpointer key);
 
 #endif