diff --git a/gfx/common/gl_common.c b/gfx/common/gl_common.c
index 0303f060cb..30ebd6d982 100644
--- a/gfx/common/gl_common.c
+++ b/gfx/common/gl_common.c
@@ -23,11 +23,9 @@ extern void gl_load_texture_data(uint32_t id_data,
       unsigned width, unsigned height,
       const void *frame, unsigned base_size);
 
-void gl_ff_vertex(const void *data)
+void gl_ff_vertex(const struct gfx_coords *coords)
 {
 #ifndef NO_GL_FF_VERTEX
-   const struct gfx_coords *coords = (const struct gfx_coords*)data;
-
    /* Fall back to fixed function-style if needed and possible. */
    glClientActiveTexture(GL_TEXTURE1);
    glTexCoordPointer(2, GL_FLOAT, 0, coords->lut_tex_coord);
@@ -42,11 +40,10 @@ void gl_ff_vertex(const void *data)
 #endif
 }
 
-void gl_ff_matrix(const void *data)
+void gl_ff_matrix(const math_matrix_4x4 *mat)
 {
 #ifndef NO_GL_FF_MATRIX
    math_matrix_4x4 ident;
-   const math_matrix_4x4 *mat = (const math_matrix_4x4*)data;
 
    /* Fall back to fixed function-style if needed and possible. */
    glMatrixMode(GL_PROJECTION);
diff --git a/gfx/common/gl_common.h b/gfx/common/gl_common.h
index e08423532e..fba6b5c182 100644
--- a/gfx/common/gl_common.h
+++ b/gfx/common/gl_common.h
@@ -339,7 +339,7 @@ static INLINE unsigned gl_wrap_type_to_enum(enum gfx_wrap_type type)
    return 0;
 }
 
-void gl_ff_vertex(const void *data);
-void gl_ff_matrix(const void *data);
+void gl_ff_vertex(const struct gfx_coords *coords);
+void gl_ff_matrix(const math_matrix_4x4 *mat);
 
 #endif