diff --git a/include/arch/aarch64/arch_helpers.h b/include/arch/aarch64/arch_helpers.h
index 836d61e..2fce668 100644
--- a/include/arch/aarch64/arch_helpers.h
+++ b/include/arch/aarch64/arch_helpers.h
@@ -208,6 +208,7 @@
 DEFINE_SYSREG_READ_FUNC(id_pfr1_el1)
 DEFINE_SYSREG_READ_FUNC(id_aa64isar1_el1)
 DEFINE_SYSREG_READ_FUNC(id_aa64pfr0_el1)
+DEFINE_SYSREG_READ_FUNC(id_aa64pfr1_el1)
 DEFINE_SYSREG_READ_FUNC(id_aa64dfr0_el1)
 DEFINE_SYSREG_READ_FUNC(id_afr0_el1)
 DEFINE_SYSREG_READ_FUNC(CurrentEl)