diff --git a/src/static_libs/rg_etc/rg_etc1.h b/src/static_libs/rg_etc/rg_etc1.h
index 8a96cc52e3..275b0dbb3d 100644
--- a/src/static_libs/rg_etc/rg_etc1.h
+++ b/src/static_libs/rg_etc/rg_etc1.h
@@ -38,10 +38,10 @@ void rg_etc1_pack_block_init();
 unsigned int rg_etc1_pack_block(void* pETC1_block, const unsigned int* pSrc_pixels_BGRA, rg_etc1_pack_params *pack_params);
 
 // ETC2 support: RGB8_ETC2
-void rg_etc2_rgb8_decode_block(const uint8_t *etc_block, uint32_t *bgra);
+void rg_etc2_rgb8_decode_block(const unsigned char *etc_block, unsigned int *bgra);
 
 // ETC2 support: RGBA8_ETC2_EAC
-void rg_etc2_rgba8_decode_block(const uint8_t *etc_block, uint32_t *bgra);
+void rg_etc2_rgba8_decode_block(const unsigned char *etc_block, unsigned int *bgra);
 
 //------------------------------------------------------------------------------
 //
diff --git a/src/static_libs/rg_etc/rg_etc2.c b/src/static_libs/rg_etc/rg_etc2.c
index 557184651b..537540d543 100644
--- a/src/static_libs/rg_etc/rg_etc2.c
+++ b/src/static_libs/rg_etc/rg_etc2.c
@@ -36,8 +36,8 @@ EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <Eina.h>
 #include "rg_etc1.h"
 
-void rg_etc2_rgb8_decode_block(const uint8_t *etc_block, uint32_t *bgra);
-void rg_etc2_rgba8_decode_block(const uint8_t *etc_block, uint32_t *bgra);
+void rg_etc2_rgb8_decode_block(const unsigned char *etc_block, unsigned int *bgra);
+void rg_etc2_rgba8_decode_block(const unsigned char *etc_block, unsigned int *bgra);
 
 typedef const uint8_t etc_block;
 
@@ -244,7 +244,7 @@ _TH_paint(const uint8_t *etc, uint32_t paint_colors[4], uint32_t *bgra)
 }
 
 void
-rg_etc2_rgb8_decode_block(const uint8_t *etc, uint32_t *bgra)
+rg_etc2_rgb8_decode_block(const unsigned char *etc, unsigned int *bgra)
 {
    // Check differential mode bit
    if ((etc[3] & 0x2) == 0)