diff --git a/libavcodec/bitstream_filter.c b/libavcodec/bitstream_filter.c
index aeafd7db40..1a6ba396d2 100644
--- a/libavcodec/bitstream_filter.c
+++ b/libavcodec/bitstream_filter.c
@@ -20,7 +20,7 @@
 
 #include "avcodec.h"
 
-AVBitStreamFilter *first_bitstream_filter= NULL;
+static AVBitStreamFilter *first_bitstream_filter= NULL;
 
 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f){
     if(f) return f->next;
diff --git a/libavcodec/parser.c b/libavcodec/parser.c
index 94399bfbbe..7262b92878 100644
--- a/libavcodec/parser.c
+++ b/libavcodec/parser.c
@@ -22,7 +22,7 @@
 
 #include "parser.h"
 
-AVCodecParser *av_first_parser = NULL;
+static AVCodecParser *av_first_parser = NULL;
 
 AVCodecParser* av_parser_next(AVCodecParser *p){
     if(p) return p->next;
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index b79d235445..31a5d37347 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -79,7 +79,7 @@ void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
 }
 
 /* encoder management */
-AVCodec *first_avcodec = NULL;
+static AVCodec *first_avcodec = NULL;
 
 AVCodec *av_codec_next(AVCodec *c){
     if(c) return c->next;