diff --git a/src/client/refresh/files/stb.c b/src/client/refresh/files/stb.c
index 2e75468e..226416f5 100644
--- a/src/client/refresh/files/stb.c
+++ b/src/client/refresh/files/stb.c
@@ -96,7 +96,7 @@ LoadSTB(const char *origname, const char* type, byte **pic, int *width, int *hei
 }
 
 qboolean
-ResizeSTB(byte *input_pixels, int input_width, int input_height,
+ResizeSTB(const byte *input_pixels, int input_width, int input_height,
 			  byte *output_pixels, int output_width, int output_height)
 {
 	if (stbir_resize_uint8(input_pixels, input_width, input_height, 0,
@@ -223,7 +223,7 @@ SmoothColorImage(unsigned *dst, size_t size, size_t rstep)
 /* https://en.wikipedia.org/wiki/Pixel-art_scaling_algorithms */
 
 void
-scale2x(byte *src, byte *dst, int width, int height)
+scale2x(const byte *src, byte *dst, int width, int height)
 {
 	/*
 		EPX/Scale2×/AdvMAME2×
@@ -239,7 +239,7 @@ scale2x(byte *src, byte *dst, int width, int height)
 		IF B==D AND B!=A AND D!=C => 4=D
 	*/
 	{
-		byte *in_buff = src;
+		const byte *in_buff = src;
 		byte *out_buff = dst;
 		byte *out_buff_full = dst + ((width * height) << 2);
 		while (out_buff < out_buff_full)
@@ -304,7 +304,7 @@ scale2x(byte *src, byte *dst, int width, int height)
 }
 
 void
-scale3x(byte *src, byte *dst, int width, int height)
+scale3x(const byte *src, byte *dst, int width, int height)
 {
 	/*
 		Scale3×/AdvMAME3× and ScaleFX
@@ -326,7 +326,7 @@ scale3x(byte *src, byte *dst, int width, int height)
 		IF F==H AND F!=B AND H!=D => 9=F
 	*/
 	{
-		byte *in_buff = src;
+		const byte *in_buff = src;
 		byte *out_buff = dst;
 		byte *out_buff_full = dst + ((width * height) * 9);
 		while (out_buff < out_buff_full)
diff --git a/src/client/refresh/gl1/gl1_model.c b/src/client/refresh/gl1/gl1_model.c
index f98f4b6c..948e95a9 100644
--- a/src/client/refresh/gl1/gl1_model.c
+++ b/src/client/refresh/gl1/gl1_model.c
@@ -210,7 +210,7 @@ Mod_SP2Fixup(model_t *mod, const dsprite_t *sprout)
 		/* byte swap everything */
 		for (i = 0; i < sprout->numframes; i++)
 		{
-			mod->skins[i] = R_FindImage(sprout->frames[i].name,
+			mod->skins[i] = R_FindImage((char *)sprout->frames[i].name,
 					it_sprite);
 		}
 	}
diff --git a/src/client/refresh/gl3/gl3_model.c b/src/client/refresh/gl3/gl3_model.c
index 643d88ec..51b4d430 100644
--- a/src/client/refresh/gl3/gl3_model.c
+++ b/src/client/refresh/gl3/gl3_model.c
@@ -1009,7 +1009,7 @@ Mod_SP2Fixup(gl3model_t *mod, const dsprite_t *sprout)
 		/* byte swap everything */
 		for (i = 0; i < sprout->numframes; i++)
 		{
-			mod->skins[i] = GL3_FindImage(sprout->frames[i].name,
+			mod->skins[i] = GL3_FindImage((char *)sprout->frames[i].name,
 					it_sprite);
 		}
 	}
diff --git a/src/client/refresh/ref_shared.h b/src/client/refresh/ref_shared.h
index dcee1ad5..ee25566e 100644
--- a/src/client/refresh/ref_shared.h
+++ b/src/client/refresh/ref_shared.h
@@ -81,11 +81,11 @@ extern void LoadPCX(char *origname, byte **pic, byte **palette, int *width, int
 extern void GetPCXInfo(char *filename, int *width, int *height);
 
 extern qboolean LoadSTB(const char *origname, const char* type, byte **pic, int *width, int *height);
-extern qboolean ResizeSTB(byte *input_pixels, int input_width, int input_height,
+extern qboolean ResizeSTB(const byte *input_pixels, int input_width, int input_height,
 			  byte *output_pixels, int output_width, int output_height);
 extern void SmoothColorImage(unsigned *dst, size_t size, size_t rstep);
-extern void scale2x(byte *src, byte *dst, int width, int height);
-extern void scale3x(byte *src, byte *dst, int width, int height);
+extern void scale2x(const byte *src, byte *dst, int width, int height);
+extern void scale3x(const byte *src, byte *dst, int width, int height);
 
 extern void GetWalInfo(char *name, int *width, int *height);
 extern void GetM8Info(char *name, int *width, int *height);
diff --git a/src/client/refresh/soft/sw_model.c b/src/client/refresh/soft/sw_model.c
index 51cbba87..ddf8bb74 100644
--- a/src/client/refresh/soft/sw_model.c
+++ b/src/client/refresh/soft/sw_model.c
@@ -169,7 +169,7 @@ Mod_SP2Fixup(model_t *mod, const dsprite_t *sprout)
 		/* byte swap everything */
 		for (i = 0; i < sprout->numframes; i++)
 		{
-			mod->skins[i] = R_FindImage (sprout->frames[i].name,
+			mod->skins[i] = R_FindImage ((char *)sprout->frames[i].name,
 					it_sprite);
 		}
 	}