diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index f9e17ae424..113ddd935d 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1795,8 +1795,7 @@ int xc_domain_debug_control(xc_interface *xch,
 int xc_cpuid_set(xc_interface *xch,
                  uint32_t domid,
                  const unsigned int *input,
-                 const char **config,
-                 char **config_transformed);
+                 const char **config);
 
 /*
  * Make adjustments to the CPUID settings for a domain.
diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index 89d2ecdad2..b42edd6457 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -279,7 +279,7 @@ int xc_set_domain_cpu_policy(xc_interface *xch, uint32_t domid,
  */
 int xc_cpuid_set(
     xc_interface *xch, uint32_t domid, const unsigned int *input,
-    const char **config, char **config_transformed)
+    const char **config)
 {
     int rc;
     unsigned int i, j, regs[4] = {}, polregs[4] = {};
@@ -288,9 +288,6 @@ int xc_cpuid_set(
     unsigned int nr_leaves, policy_leaves, nr_msrs;
     uint32_t err_leaf = -1, err_subleaf = -1, err_msr = -1;
 
-    for ( i = 0; i < 4; ++i )
-        config_transformed[i] = NULL;
-
     if ( xc_domain_getinfo(xch, domid, 1, &di) != 1 ||
          di.domid != domid )
     {
@@ -365,13 +362,6 @@ int xc_cpuid_set(
             continue;
         }
 
-        config_transformed[i] = calloc(33, 1); /* 32 bits, NUL terminator. */
-        if ( config_transformed[i] == NULL )
-        {
-            rc = -ENOMEM;
-            goto fail;
-        }
-
         /*
          * Notes for following this algorithm:
          *
@@ -399,11 +389,6 @@ int xc_cpuid_set(
                 set_feature(31 - j, regs[i]);
             else
                 clear_feature(31 - j, regs[i]);
-
-            config_transformed[i][j] = config[i][j];
-            /* All non 0/1 values get overwritten. */
-            if ( (config[i][j] & ~1) != '0' )
-                config_transformed[i][j] = '0' + val;
         }
     }
 
@@ -421,16 +406,8 @@ int xc_cpuid_set(
     }
 
     /* Success! */
-    goto out;
 
  fail:
-    for ( i = 0; i < 4; i++ )
-    {
-        free(config_transformed[i]);
-        config_transformed[i] = NULL;
-    }
-
- out:
     free(leaves);
 
     return rc;
diff --git a/tools/libxl/libxl_cpuid.c b/tools/libxl/libxl_cpuid.c
index 4e4852ddeb..796ec4f2d9 100644
--- a/tools/libxl/libxl_cpuid.c
+++ b/tools/libxl/libxl_cpuid.c
@@ -421,7 +421,6 @@ void libxl__cpuid_legacy(libxl_ctx *ctx, uint32_t domid,
 {
     libxl_cpuid_policy_list cpuid = info->cpuid;
     int i;
-    char *cpuid_res[4];
     bool pae = true;
 
     /*
@@ -444,7 +443,7 @@ void libxl__cpuid_legacy(libxl_ctx *ctx, uint32_t domid,
 
     for (i = 0; cpuid[i].input[0] != XEN_CPUID_INPUT_UNUSED; i++)
         xc_cpuid_set(ctx->xch, domid, cpuid[i].input,
-                     (const char**)(cpuid[i].policy), cpuid_res);
+                     (const char**)cpuid[i].policy);
 }
 
 static const char *input_names[2] = { "leaf", "subleaf" };