diff --git a/src/cpu/cpu_aarch64.c b/src/cpu/cpu_aarch64.c
index 3c3e749f7c..7255d9fdf6 100644
--- a/src/cpu/cpu_aarch64.c
+++ b/src/cpu/cpu_aarch64.c
@@ -108,11 +108,18 @@ AArch64Baseline(virCPUDefPtr *cpus,
     return cpu;
 }
 
+static virCPUCompareResult
+AArch64Compare(virCPUDefPtr host ATTRIBUTE_UNUSED,
+               virCPUDefPtr cpu ATTRIBUTE_UNUSED)
+{
+    return VIR_CPU_COMPARE_IDENTICAL;
+}
+
 struct cpuArchDriver cpuDriverAARCH64 = {
     .name = "aarch64",
     .arch = archs,
     .narch = ARRAY_CARDINALITY(archs),
-    .compare = NULL,
+    .compare = AArch64Compare,
     .decode = AArch64Decode,
     .encode = NULL,
     .free = AArch64DataFree,
diff --git a/src/cpu/cpu_arm.c b/src/cpu/cpu_arm.c
index ec80b35473..53bf4f499e 100644
--- a/src/cpu/cpu_arm.c
+++ b/src/cpu/cpu_arm.c
@@ -109,11 +109,18 @@ ArmBaseline(virCPUDefPtr *cpus,
     return cpu;
 }
 
+static virCPUCompareResult
+ArmCompare(virCPUDefPtr host ATTRIBUTE_UNUSED,
+           virCPUDefPtr cpu ATTRIBUTE_UNUSED)
+{
+    return VIR_CPU_COMPARE_IDENTICAL;
+}
+
 struct cpuArchDriver cpuDriverArm = {
     .name = "arm",
     .arch = archs,
     .narch = ARRAY_CARDINALITY(archs),
-    .compare = NULL,
+    .compare = ArmCompare,
     .decode = ArmDecode,
     .encode = NULL,
     .free = ArmDataFree,