diff --git a/spm/common/spm_helpers.h b/spm/common/spm_helpers.h
index f241e42..10f7316 100644
--- a/spm/common/spm_helpers.h
+++ b/spm/common/spm_helpers.h
@@ -8,8 +8,10 @@
 #define SPMC_H
 
 #include <ffa_helpers.h>
+#include <spm_common.h>
 
 /* Should match with IDs defined in SPM/Hafnium */
+#define SPM_INTERRUPT_ENABLE            (0xFF03)
 #define SPM_INTERRUPT_GET               (0xFF04)
 #define SPM_DEBUG_LOG                   (0xBD000000)
 
@@ -18,6 +20,7 @@
  */
 
 uint32_t spm_interrupt_get(void);
+int64_t spm_interrupt_enable(uint32_t int_id, bool enable, enum interrupt_pin pin);
 void spm_debug_log(char c);
 
 #endif /* SPMC_H */