diff --git a/pipewire-jack/src/export.c b/pipewire-jack/src/export.c
index 10c971bca..4c9daf057 100644
--- a/pipewire-jack/src/export.c
+++ b/pipewire-jack/src/export.c
@@ -23,14 +23,14 @@
 #include <spa/utils/defs.h>
 
 #define JACK_METADATA_PREFIX "http://jackaudio.org/metadata/"
-SPA_EXPORT const char JACK_METADATA_CONNECTED[]   = JACK_METADATA_PREFIX "connected";
-SPA_EXPORT const char JACK_METADATA_EVENT_TYPES[] = JACK_METADATA_PREFIX "event-types";
-SPA_EXPORT const char JACK_METADATA_HARDWARE[]    = JACK_METADATA_PREFIX "hardware";
-SPA_EXPORT const char JACK_METADATA_ICON_LARGE[]  = JACK_METADATA_PREFIX "icon-large";
-SPA_EXPORT const char JACK_METADATA_ICON_NAME[]   = JACK_METADATA_PREFIX "icon-name";
-SPA_EXPORT const char JACK_METADATA_ICON_SMALL[]  = JACK_METADATA_PREFIX "icon-small";
-SPA_EXPORT const char JACK_METADATA_ORDER[]       = JACK_METADATA_PREFIX "order";
-SPA_EXPORT const char JACK_METADATA_PORT_GROUP[]  = JACK_METADATA_PREFIX "port-group";
-SPA_EXPORT const char JACK_METADATA_PRETTY_NAME[] = JACK_METADATA_PREFIX "pretty-name";
-SPA_EXPORT const char JACK_METADATA_SIGNAL_TYPE[] = JACK_METADATA_PREFIX "signal-type";
+SPA_EXPORT const char *JACK_METADATA_CONNECTED   = JACK_METADATA_PREFIX "connected";
+SPA_EXPORT const char *JACK_METADATA_EVENT_TYPES = JACK_METADATA_PREFIX "event-types";
+SPA_EXPORT const char *JACK_METADATA_HARDWARE    = JACK_METADATA_PREFIX "hardware";
+SPA_EXPORT const char *JACK_METADATA_ICON_LARGE  = JACK_METADATA_PREFIX "icon-large";
+SPA_EXPORT const char *JACK_METADATA_ICON_NAME   = JACK_METADATA_PREFIX "icon-name";
+SPA_EXPORT const char *JACK_METADATA_ICON_SMALL  = JACK_METADATA_PREFIX "icon-small";
+SPA_EXPORT const char *JACK_METADATA_ORDER       = JACK_METADATA_PREFIX "order";
+SPA_EXPORT const char *JACK_METADATA_PORT_GROUP  = JACK_METADATA_PREFIX "port-group";
+SPA_EXPORT const char *JACK_METADATA_PRETTY_NAME = JACK_METADATA_PREFIX "pretty-name";
+SPA_EXPORT const char *JACK_METADATA_SIGNAL_TYPE = JACK_METADATA_PREFIX "signal-type";
 #undef JACK_METADATA_PREFIX