diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index a57dcdc4421f7db92d5ba1210c53ad06faaa5a17..b1a6dbb2f92ec7038e583423724457afad9c0eaa 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -185,7 +185,7 @@ typedef struct {
     DSPContext dsp;
 } DCAContext;
 
-static void dca_init_vlcs()
+static void dca_init_vlcs(void)
 {
     static int vlcs_inited = 0;
     int i, j;
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 2750173b14c6ee261644509aa108d7a6b5cef691..085e18a896b31465ef47c81f59ff10a0d4c95243 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -3029,7 +3029,7 @@ static void hl_motion(H264Context *h, uint8_t *dest_y, uint8_t *dest_cb, uint8_t
     prefetch_motion(h, 1);
 }
 
-static void decode_init_vlc(){
+static void decode_init_vlc(void){
     static int done = 0;
 
     if (!done) {
diff --git a/libavformat/allformats.h b/libavformat/allformats.h
index e82ab80f5a85e4aa1b13acbeba1133969f5ed43d..8b36c98c5f19b1abde56efffb24dfe2785704737 100644
--- a/libavformat/allformats.h
+++ b/libavformat/allformats.h
@@ -179,6 +179,6 @@ int pcm_read_seek(AVFormatContext *s,
 /* rtsp.c */
 int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f);
 /* rtp.c */
-void av_register_rtp_dynamic_payload_handlers();
+void av_register_rtp_dynamic_payload_handlers(void);
 
 #endif
diff --git a/libavformat/rtp.c b/libavformat/rtp.c
index 493a89cf3f71ae3f4d763ec1f71e5aafe065b033..439fd6d3f8e62e1494c018a908b409cf1f5edb7f 100644
--- a/libavformat/rtp.c
+++ b/libavformat/rtp.c
@@ -186,7 +186,7 @@ static void register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
     RTPFirstDynamicPayloadHandler= handler;
 }
 
-void av_register_rtp_dynamic_payload_handlers()
+void av_register_rtp_dynamic_payload_handlers(void)
 {
     register_dynamic_payload_handler(&mp4v_es_handler);
     register_dynamic_payload_handler(&mpeg4_generic_handler);
diff --git a/libavformat/rtp_h264.c b/libavformat/rtp_h264.c
index d38e8780d82e59db2a5a61921d7c940c9d1b0c8a..0ae6aa664d924ee3f1c4b68ca79cfb965d154630 100644
--- a/libavformat/rtp_h264.c
+++ b/libavformat/rtp_h264.c
@@ -312,7 +312,7 @@ static int h264_handle_packet(RTPDemuxContext * s,
 }
 
 /* ---------------- public code */
-static void *h264_new_extradata()
+static void *h264_new_extradata(void)
 {
     h264_rtp_extra_data *data =
         av_mallocz(sizeof(h264_rtp_extra_data) +