diff --git a/xf86drm.c b/xf86drm.c
index e73cdddc..ffc53b89 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -1719,7 +1719,7 @@ int drmAgpEnable(int fd, unsigned long mode)
 {
     drm_agp_mode_t m;
 
-    memclear(mode);
+    memclear(m);
     m.mode = mode;
     if (drmIoctl(fd, DRM_IOCTL_AGP_ENABLE, &m))
 	return -errno;