diff --git a/stream/open.c b/stream/open.c
index c207516184..2fa4c9fc99 100644
--- a/stream/open.c
+++ b/stream/open.c
@@ -47,7 +47,7 @@ int dvd_title=0;
 
 // Open a new stream  (stdin/file/vcd/url)
 
-stream_t* open_stream(char* filename,char** options, int* file_format){
+stream_t* open_stream(const char* filename,char** options, int* file_format){
   // Check if playlist or unknown
   if (*file_format != DEMUXER_TYPE_PLAYLIST){
     *file_format=DEMUXER_TYPE_UNKNOWN;
diff --git a/stream/stream.c b/stream/stream.c
index bcd1f907c3..daecc09d2c 100644
--- a/stream/stream.c
+++ b/stream/stream.c
@@ -140,7 +140,7 @@ static const stream_info_t* const auto_open_streams[] = {
   NULL
 };
 
-static stream_t* open_stream_plugin(const stream_info_t* sinfo, char* filename,
+static stream_t* open_stream_plugin(const stream_info_t* sinfo, const char* filename,
                                     int mode, char** options, int* file_format,
                                     int* ret, char** redirected_url)
 {
@@ -208,7 +208,7 @@ static stream_t* open_stream_plugin(const stream_info_t* sinfo, char* filename,
 }
 
 
-stream_t* open_stream_full(char* filename,int mode, char** options, int* file_format) {
+stream_t* open_stream_full(const char* filename,int mode, char** options, int* file_format) {
   int i,j,l,r;
   const stream_info_t* sinfo;
   stream_t* s;
@@ -250,7 +250,7 @@ stream_t* open_stream_full(char* filename,int mode, char** options, int* file_fo
   return NULL;
 }
 
-stream_t* open_output_stream(char* filename,char** options) {
+stream_t* open_output_stream(const char* filename, char** options) {
   int file_format; //unused
   if(!filename) {
     mp_msg(MSGT_OPEN,MSGL_ERR,"open_output_stream(), NULL filename, report this bug\n");
diff --git a/stream/stream.h b/stream/stream.h
index fa12186696..f1a3667343 100644
--- a/stream/stream.h
+++ b/stream/stream.h
@@ -339,9 +339,9 @@ int stream_control(stream_t *s, int cmd, void *arg);
 stream_t* new_stream(int fd,int type);
 void free_stream(stream_t *s);
 stream_t* new_memory_stream(unsigned char* data,int len);
-stream_t* open_stream(char* filename,char** options,int* file_format);
-stream_t* open_stream_full(char* filename,int mode, char** options, int* file_format);
-stream_t* open_output_stream(char* filename,char** options);
+stream_t* open_stream(const char* filename,char** options,int* file_format);
+stream_t* open_stream_full(const char* filename,int mode, char** options, int* file_format);
+stream_t* open_output_stream(const char* filename,char** options);
 /// Set the callback to be used by libstream to check for user
 /// interruption during long blocking operations (cache filling, etc).
 void stream_set_interrupt_callback(int (*cb)(int));