diff --git a/apps/plugin.c b/apps/plugin.c
index a5cdfc3d8a..658064c53e 100644
--- a/apps/plugin.c
+++ b/apps/plugin.c
@@ -798,8 +798,10 @@ static const struct plugin_api rockbox_api = {
     /* new stuff at the end, sort into place next time
        the API gets incompatible */
 
+#if CONFIG_CODEC == SWCODEC
     mixer_set_frequency,
     mixer_get_frequency,
+#endif
 };
 
 int plugin_load(const char* plugin, const void* parameter)
diff --git a/apps/plugin.h b/apps/plugin.h
index f926b3428d..874b9b4a56 100644
--- a/apps/plugin.h
+++ b/apps/plugin.h
@@ -970,8 +970,10 @@ struct plugin_api {
     /* new stuff at the end, sort into place next time
        the API gets incompatible */
 
+#if CONFIG_CODEC == SWCODEC
     void (*mixer_set_frequency)(unsigned int samplerate);
     unsigned int (*mixer_get_frequency)(void);
+#endif
 };
 
 /* plugin header */