diff --git a/linux-core/drm_memory.h b/linux-core/drm_memory.h
index 59e86b0c..98ea89d8 100644
--- a/linux-core/drm_memory.h
+++ b/linux-core/drm_memory.h
@@ -35,6 +35,7 @@
 
 #define __NO_VERSION__
 #include <linux/config.h>
+#include <linux/highmem.h>
 #include "drmP.h"
 
 /**
diff --git a/linux/drm_memory.h b/linux/drm_memory.h
index 59e86b0c..98ea89d8 100644
--- a/linux/drm_memory.h
+++ b/linux/drm_memory.h
@@ -35,6 +35,7 @@
 
 #define __NO_VERSION__
 #include <linux/config.h>
+#include <linux/highmem.h>
 #include "drmP.h"
 
 /**