diff --git a/src/cpu/cpu_powerpc.c b/src/cpu/cpu_powerpc.c
index 871401b0170aeca0ab844d8ce5057d83404c5743..1cd6874c0508ebce750c2ebb21a850d453652edb 100644
--- a/src/cpu/cpu_powerpc.c
+++ b/src/cpu/cpu_powerpc.c
@@ -666,11 +666,15 @@ ppcGetModels(char ***models)
 
     model = map->models;
     while (model != NULL) {
-        if (VIR_STRDUP(name, model->name) < 0)
-            goto error;
+        if (models) {
+            if (VIR_STRDUP(name, model->name) < 0)
+                goto error;
 
-        if (VIR_INSERT_ELEMENT(*models, 0, nmodels, name) < 0)
-            goto error;
+            if (VIR_APPEND_ELEMENT(*models, nmodels, name) < 0)
+                goto error;
+        } else {
+            nmodels++;
+        }
 
         model = model->next;
     }
@@ -681,7 +685,10 @@ ppcGetModels(char ***models)
     return nmodels;
 
  error:
-    virStringFreeList(*models);
+    if (models) {
+        virStringFreeList(*models);
+        *models = NULL;
+    }
     nmodels = -1;
     goto cleanup;
 }
diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index f6dcba41d087178b4fea0f8948aaa3e6b8069f45..45be262307e85bfe36aa4f268fcf428a3ed5c287 100644
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -2176,11 +2176,15 @@ x86GetModels(char ***models)
 
     model = map->models;
     while (model != NULL) {
-        if (VIR_STRDUP(name, model->name) < 0)
-            goto error;
+        if (models) {
+            if (VIR_STRDUP(name, model->name) < 0)
+                goto error;
 
-        if (VIR_INSERT_ELEMENT(*models, 0, nmodels, name) < 0)
-            goto error;
+            if (VIR_APPEND_ELEMENT(*models, nmodels, name) < 0)
+                goto error;
+        } else {
+            nmodels++;
+        }
 
         model = model->next;
     }
@@ -2188,7 +2192,10 @@ x86GetModels(char ***models)
     return nmodels;
 
  error:
-    virStringFreeList(*models);
+    if (models) {
+        virStringFreeList(*models);
+        *models = NULL;
+    }
     return -1;
 }