3 files changed, 6 insertions, 6 deletions

diff --git a/apps/plugins/midi/midifile.c b/apps/plugins/midi/midifile.c
index 5f98e895a2..6411b8e658 100644
--- a/apps/plugins/midi/midifile.c
+++ b/apps/plugins/midi/midifile.c
@@ -26,7 +26,7 @@ int readID(int file);
 
 struct MIDIfile midi_file IBSS_ATTR;
 
-struct MIDIfile * loadFile(char * filename)
+struct MIDIfile * loadFile(const char * filename)
 {
     struct MIDIfile * mfload;
     int file = rb->open (filename, O_RDONLY);
diff --git a/apps/plugins/midi/midifile.h b/apps/plugins/midi/midifile.h
index a1024d500b..25ab2f5b19 100644
--- a/apps/plugins/midi/midifile.h
+++ b/apps/plugins/midi/midifile.h
@@ -17,5 +17,5 @@
  *
  ****************************************************************************/
 
-struct MIDIfile * loadFile(char * filename);
+struct MIDIfile * loadFile(const char * filename);
 
diff --git a/apps/plugins/midi/midiplay.c b/apps/plugins/midi/midiplay.c
index e97d7acf1c..69be53e75d 100644
--- a/apps/plugins/midi/midiplay.c
+++ b/apps/plugins/midi/midiplay.c
@@ -191,11 +191,11 @@ int32_t gmbuf[BUF_SIZE*NBUF];
 static unsigned int samples_in_buf;
 
 int quit=0;
-struct plugin_api * rb;
+const struct plugin_api * rb;
 
-static int midimain(void * filename);
+static int midimain(const void * filename);
 
-enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
+enum plugin_status plugin_start(const struct plugin_api* api, const void* parameter)
 {
     int retval = 0;
 
@@ -292,7 +292,7 @@ void get_more(unsigned char** start, size_t* size)
 #endif
 }
 
-static int midimain(void * filename)
+static int midimain(const void * filename)
 {
     int notesUsed = 0;
     int a=0;