diff --git a/cogl/cogl-texture-2d-sliced.c b/cogl/cogl-texture-2d-sliced.c
index 36292f8c9..adbbb144e 100644
--- a/cogl/cogl-texture-2d-sliced.c
+++ b/cogl/cogl-texture-2d-sliced.c
@@ -783,8 +783,8 @@ _cogl_texture_2d_sliced_slices_create (CoglTexture2DSliced *tex_2ds,
     }
   else
     {
-      max_width = cogl_util_next_p2 (width);
-      max_height = cogl_util_next_p2 (height);
+      max_width = _cogl_util_next_p2 (width);
+      max_height = _cogl_util_next_p2 (height);
       tex_2ds->gl_target = GL_TEXTURE_2D;
       slices_for_size = _cogl_pot_slices_for_size;
     }
diff --git a/cogl/cogl-util.c b/cogl/cogl-util.c
index 369017b8c..f6d3709f2 100644
--- a/cogl/cogl-util.c
+++ b/cogl/cogl-util.c
@@ -40,16 +40,17 @@
 #include "cogl-handle.h"
 #include "cogl-util.h"
 
-/**
+/*
  * cogl_util_next_p2:
- * @a: Value to get the next power
+ * @a: Value to get the next power of two
  *
- * Calculates the next power greater than @a.
+ * Calculates the next power of two greater than or equal to @a.
  *
- * Return value: The next power after @a.
+ * Return value: @a if @a is already a power of two, otherwise returns
+ *   the next nearest power of two.
  */
 int
-cogl_util_next_p2 (int a)
+_cogl_util_next_p2 (int a)
 {
   int rval = 1;
 
diff --git a/cogl/cogl-util.h b/cogl/cogl-util.h
index f63863a42..64ba8ffcf 100644
--- a/cogl/cogl-util.h
+++ b/cogl/cogl-util.h
@@ -28,7 +28,7 @@
 #include <math.h>
 
 int
-cogl_util_next_p2 (int a);
+_cogl_util_next_p2 (int a);
 
 /* The signbit macro is defined by ISO C99 so it should be available,
    however if it's not we can fallback to an evil hack */