diff --git a/hw/xfree86/common/xf86Extensions.c b/hw/xfree86/common/xf86Extensions.c
index d5309d558..f9e791607 100644
--- a/hw/xfree86/common/xf86Extensions.c
+++ b/hw/xfree86/common/xf86Extensions.c
@@ -53,7 +53,7 @@
 /*
  * DDX-specific extensions.
  */
-static ExtensionModule extensionModules[] = {
+static const ExtensionModule extensionModules[] = {
 #ifdef XF86VIDMODE
     {
 	XFree86VidModeExtensionInit,
diff --git a/hw/xfree86/dixmods/glxmodule.c b/hw/xfree86/dixmods/glxmodule.c
index c0c611401..e6bb73673 100644
--- a/hw/xfree86/dixmods/glxmodule.c
+++ b/hw/xfree86/dixmods/glxmodule.c
@@ -47,7 +47,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 static MODULESETUPPROTO(glxSetup);
 
-static ExtensionModule GLXExt = {
+static const ExtensionModule GLXExt = {
     GlxExtensionInit,
     "GLX",
     &noGlxExtension
diff --git a/hw/xquartz/quartz.c b/hw/xquartz/quartz.c
index 31b0e619a..5b977c7f9 100644
--- a/hw/xquartz/quartz.c
+++ b/hw/xquartz/quartz.c
@@ -145,7 +145,7 @@ QuartzSetupScreen(int index,
     return TRUE;
 }
 
-static ExtensionModule quartzExtensions[] = {
+static const ExtensionModule quartzExtensions[] = {
     /* PseudoramiX needs to be done before RandR, so
      * it is in miinitext.c until it can be reordered.
      * { PseudoramiXExtensionInit, "PseudoramiX", &noPseudoramiXExtension },