diff --git a/include/asm-mips/smtc_ipi.h b/include/asm-mips/smtc_ipi.h
index 55f3419f65465892f35630c3a32b730866ed77e1..360ea6d250c7a7aab3ec8516cffb99413bfe0e66 100644
--- a/include/asm-mips/smtc_ipi.h
+++ b/include/asm-mips/smtc_ipi.h
@@ -4,6 +4,8 @@
 #ifndef __ASM_SMTC_IPI_H
 #define __ASM_SMTC_IPI_H
 
+#include <linux/spinlock.h>
+
 //#define SMTC_IPI_DEBUG
 
 #ifdef SMTC_IPI_DEBUG