diff --git a/spm/common/spm_helpers.h b/spm/common/spm_helpers.h
index 10f7316..25c6493 100644
--- a/spm/common/spm_helpers.h
+++ b/spm/common/spm_helpers.h
@@ -13,6 +13,7 @@
 /* Should match with IDs defined in SPM/Hafnium */
 #define SPM_INTERRUPT_ENABLE            (0xFF03)
 #define SPM_INTERRUPT_GET               (0xFF04)
+#define SPM_INTERRUPT_DEACTIVATE	(0xFF08)
 #define SPM_DEBUG_LOG                   (0xBD000000)
 
 /*
@@ -21,6 +22,7 @@
 
 uint32_t spm_interrupt_get(void);
 int64_t spm_interrupt_enable(uint32_t int_id, bool enable, enum interrupt_pin pin);
+int64_t spm_interrupt_deactivate(uint32_t vint_id);
 void spm_debug_log(char c);
 
 #endif /* SPMC_H */