diff --git a/libavcodec/dwt.c b/libavcodec/dwt.c
index 2ecb04a4ee..d9d58de8b2 100644
--- a/libavcodec/dwt.c
+++ b/libavcodec/dwt.c
@@ -697,7 +697,7 @@ void ff_spatial_idwt_buffered_slice(DWTContext *dsp, DWTCompose *cs, slice_buffe
     }
 }
 
-void ff_spatial_idwt_init(DWTCompose *cs, IDWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count){
+static void ff_spatial_idwt_init(DWTCompose *cs, IDWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count){
     int level;
     for(level=decomposition_count-1; level>=0; level--){
         switch(type){
@@ -707,7 +707,7 @@ void ff_spatial_idwt_init(DWTCompose *cs, IDWTELEM *buffer, int width, int heigh
     }
 }
 
-void ff_spatial_idwt_slice(DWTCompose *cs, IDWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count, int y){
+static void ff_spatial_idwt_slice(DWTCompose *cs, IDWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count, int y){
     const int support = type==1 ? 3 : 5;
     int level;
     if(type==2) return;
diff --git a/libavcodec/dwt.h b/libavcodec/dwt.h
index 8c3aa204d6..b10e4f5596 100644
--- a/libavcodec/dwt.h
+++ b/libavcodec/dwt.h
@@ -146,8 +146,6 @@ void ff_spatial_dwt(int *buffer, int width, int height, int stride, int type, in
 
 void ff_spatial_idwt_buffered_init(DWTCompose *cs, slice_buffer * sb, int width, int height, int stride_line, int type, int decomposition_count);
 void ff_spatial_idwt_buffered_slice(DWTContext *dsp, DWTCompose *cs, slice_buffer * slice_buf, int width, int height, int stride_line, int type, int decomposition_count, int y);
-void ff_spatial_idwt_init(DWTCompose *cs, IDWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count);
-void ff_spatial_idwt_slice(DWTCompose *cs, IDWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count, int y);
 void ff_spatial_idwt(IDWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count);
 
 void ff_dwt_init(DWTContext *c);