diff --git a/protos/src/plugin.rs b/protos/src/plugin.rs
index ce491e751a..b68d83fecd 100644
--- a/protos/src/plugin.rs
+++ b/protos/src/plugin.rs
@@ -5,6 +5,7 @@
 pub use crate::generated::plugin::*;
 
 /// Converts protobuf representation of CpuId data into KVM format.
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 pub fn cpuid_proto_to_kvm(entry: &CpuidEntry) -> kvm_sys::kvm_cpuid_entry2 {
     // Safe: C structures are expected to be zero-initialized.
     let mut e: kvm_sys::kvm_cpuid_entry2 = unsafe { std::mem::zeroed() };
@@ -22,6 +23,7 @@ pub fn cpuid_proto_to_kvm(entry: &CpuidEntry) -> kvm_sys::kvm_cpuid_entry2 {
 }
 
 /// Converts KVM representation of CpuId data into protobuf format.
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 pub fn cpuid_kvm_to_proto(entry: &kvm_sys::kvm_cpuid_entry2) -> CpuidEntry {
     let mut e = CpuidEntry::new();
     e.function = entry.function;