diff --git a/spm/common/spm_helpers.c b/spm/common/spm_helpers.c
index 2ccf3f7..82fdae5 100644
--- a/spm/common/spm_helpers.c
+++ b/spm/common/spm_helpers.c
@@ -49,3 +49,20 @@
 
 	return (int64_t)ret.ret0;
 }
+
+/**
+ * Hypervisor call to drop the priority and de-activate a secure interrupt.
+ * Returns 0 on success, or -1 if passing an invalid interrupt id.
+ */
+int64_t spm_interrupt_deactivate(uint32_t vint_id)
+{
+	hvc_args args = {
+		.fid = SPM_INTERRUPT_DEACTIVATE,
+		.arg1 = vint_id, /* pint_id */
+		.arg2 = vint_id
+	};
+
+	hvc_ret_values ret = tftf_hvc(&args);
+
+	return (int64_t)ret.ret0;
+}
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 */