diff --git a/docs/viewperf.rst b/docs/viewperf.rst
index 6b1acf5ab11..86fec8c81bc 100644
--- a/docs/viewperf.rst
+++ b/docs/viewperf.rst
@@ -121,7 +121,7 @@ Maya-03 test 2
 
 This test makes some unusual calls to glRotate. For example:
 
-::
+.. code-block:: c
 
    glRotate(50, 50, 50, 1);
    glRotate(100, 100, 100, 1);
diff --git a/docs/xlibdriver.rst b/docs/xlibdriver.rst
index e07aed6c843..11e89ae6b0e 100644
--- a/docs/xlibdriver.rst
+++ b/docs/xlibdriver.rst
@@ -140,7 +140,7 @@ GLX_MESA_pixmap_colormap
 
 This extension adds the GLX function:
 
-::
+.. code-block:: c
 
    GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
                                      Pixmap pixmap, Colormap cmap )
@@ -173,7 +173,7 @@ The GLX_MESA_release_buffers extension allows a client to explicitly
 deallocate the ancillary buffers by calling glxReleaseBuffersMESA() just
 before an X window is destroyed. For example:
 
-::
+.. code-block:: c
 
    #ifdef GLX_MESA_release_buffers
       glXReleaseBuffersMESA( dpy, window );