diff --git a/include/QF/GLSL/qf_textures.h b/include/QF/GLSL/qf_textures.h
index 2298c3e16..3a5f0b8b7 100644
--- a/include/QF/GLSL/qf_textures.h
+++ b/include/QF/GLSL/qf_textures.h
@@ -33,13 +33,13 @@
 typedef struct scrap_s scrap_t;
 
 int GLSL_LoadQuakeTexture (const char *identifier, int width, int height,
-						   byte *data);
+						   const byte *data);
 struct texture_s;
 int GLSL_LoadQuakeMipTex (const struct texture_s *tex);
 int GLSL_LoadRGBTexture (const char *identifier, int width, int height,
-						 byte *data);
+						 const byte *data);
 int GLSL_LoadRGBATexture (const char *identifier, int width, int height,
-						  byte *data);
+						  const byte *data);
 void GLSL_ReleaseTexture (int tex);
 void GLSL_TextureInit (void);
 
diff --git a/libs/video/renderer/glsl/glsl_textures.c b/libs/video/renderer/glsl/glsl_textures.c
index 9b80351ee..96c0f0c77 100644
--- a/libs/video/renderer/glsl/glsl_textures.c
+++ b/libs/video/renderer/glsl/glsl_textures.c
@@ -72,7 +72,7 @@ static int max_tex_size;
 
 int
 GLSL_LoadQuakeTexture (const char *identifier, int width, int height,
-					   byte *data)
+					   const byte *data)
 {
 	GLuint      tnum;
 
@@ -204,7 +204,8 @@ GLSL_LoadQuakeMipTex (const texture_t *tex)
 }
 
 int
-GLSL_LoadRGBTexture (const char *identifier, int width, int height, byte *data)
+GLSL_LoadRGBTexture (const char *identifier, int width, int height,
+					 const byte *data)
 {
 	GLuint      tnum;
 
@@ -222,7 +223,8 @@ GLSL_LoadRGBTexture (const char *identifier, int width, int height, byte *data)
 }
 
 int
-GLSL_LoadRGBATexture (const char *identifier, int width, int height, byte *data)
+GLSL_LoadRGBATexture (const char *identifier, int width, int height,
+					  const byte *data)
 {
 	GLuint      tnum;