diff --git a/libretro-common/formats/png/rpng_decode.c b/libretro-common/formats/png/rpng_decode.c
index 1dcb1ed0e2..5911a6403a 100644
--- a/libretro-common/formats/png/rpng_decode.c
+++ b/libretro-common/formats/png/rpng_decode.c
@@ -236,7 +236,7 @@ static void png_reverse_filter_copy_line_plt(uint32_t *data,
    }
 }
 
-void png_pass_geom(const struct png_ihdr *ihdr,
+static void png_pass_geom(const struct png_ihdr *ihdr,
       unsigned width, unsigned height,
       unsigned *bpp_out, unsigned *pitch_out, size_t *pass_size)
 {
@@ -321,7 +321,7 @@ static const struct adam7_pass passes[] = {
    { 0, 1, 1, 2 },
 };
 
-int png_reverse_filter_init(const struct png_ihdr *ihdr,
+static int png_reverse_filter_init(const struct png_ihdr *ihdr,
       struct rpng_process_t *pngp)
 {
    size_t pass_size;
diff --git a/libretro-common/formats/png/rpng_decode.h b/libretro-common/formats/png/rpng_decode.h
index 7f763a9098..1bf06d269e 100644
--- a/libretro-common/formats/png/rpng_decode.h
+++ b/libretro-common/formats/png/rpng_decode.h
@@ -33,15 +33,8 @@ enum png_process_code
 
 enum png_chunk_type png_chunk_type(const struct png_chunk *chunk);
 
-void png_pass_geom(const struct png_ihdr *ihdr,
-      unsigned width, unsigned height,
-      unsigned *bpp_out, unsigned *pitch_out, size_t *pass_size);
-
 bool png_process_ihdr(struct png_ihdr *ihdr);
 
-int png_reverse_filter_init(const struct png_ihdr *ihdr,
-      struct rpng_process_t *pngp);
-
 int png_reverse_filter_iterate(struct rpng_t *rpng,
       uint32_t **data);