diff --git a/arch/alpha/include/asm/mmu_context.h b/arch/alpha/include/asm/mmu_context.h
index 384bd47b51871..45c020a0fe761 100644
--- a/arch/alpha/include/asm/mmu_context.h
+++ b/arch/alpha/include/asm/mmu_context.h
@@ -8,6 +8,7 @@
  */
 
 #include <linux/mm_types.h>
+#include <linux/sched.h>
 
 #include <asm/machvec.h>
 #include <asm/compiler.h>