diff --git a/rEFIt_UEFI/Platform/FixBiosDsdt.cpp b/rEFIt_UEFI/Platform/FixBiosDsdt.cpp
index c750ac4879..dca54debdc 100755
--- a/rEFIt_UEFI/Platform/FixBiosDsdt.cpp
+++ b/rEFIt_UEFI/Platform/FixBiosDsdt.cpp
@@ -2961,7 +2961,7 @@ UINT32 FIXNetwork (UINT8 *dsdt, UINT32 len, UINT32 card)
   if (gSettings.FakeLAN) {
     FakeID = gSettings.FakeLAN >> 16;
     FakeVen = gSettings.FakeLAN & 0xFFFF;
-    snprintf(NameCard, 32, "pci%04x,%04x", FakeVen, FakeID);
+    snprintf(NameCard, 32, "pci%x,%x", FakeVen, FakeID);
     Netmodel[card] = get_net_model((FakeVen << 16) + FakeID);
   }
 
@@ -3163,7 +3163,7 @@ UINT32 FIXAirport (UINT8 *dsdt, UINT32 len)
   if (gSettings.FakeWIFI) {
     FakeID = gSettings.FakeWIFI >> 16;
     FakeVen = gSettings.FakeWIFI & 0xFFFF;
-    snprintf(NameCard, 32, "pci%04x,%04x", FakeVen, FakeID);
+    snprintf(NameCard, 32, "pci%x,%x", FakeVen, FakeID);
   }
 
   PCIADR = GetPciDevice(dsdt, len);
diff --git a/rEFIt_UEFI/Platform/Settings.cpp b/rEFIt_UEFI/Platform/Settings.cpp
index 018a3c9286..c7e4590a65 100644
--- a/rEFIt_UEFI/Platform/Settings.cpp
+++ b/rEFIt_UEFI/Platform/Settings.cpp
@@ -6863,7 +6863,7 @@ GetDevices ()
 
             default:
               gfx->Vendor = Unknown;
-              snprintf (gfx->Model, 64, "pci%04x,%04x", Pci.Hdr.VendorId, Pci.Hdr.DeviceId);
+              snprintf (gfx->Model, 64, "pci%x,%x", Pci.Hdr.VendorId, Pci.Hdr.DeviceId);
               gfx->Ports  = 1;
               gfx->Connectors = (1 << NGFX);
               gfx->ConnChanged = FALSE;
diff --git a/rEFIt_UEFI/Platform/ati.cpp b/rEFIt_UEFI/Platform/ati.cpp
index 8edde532bf..1dface1200 100644
--- a/rEFIt_UEFI/Platform/ati.cpp
+++ b/rEFIt_UEFI/Platform/ati.cpp
@@ -1322,7 +1322,7 @@ BOOLEAN get_name_pci_val(value_t *val, INTN index, BOOLEAN Sier)
     return FALSE;
   }
 
-  snprintf(pciName, 15, "pci1002,%04x", gSettings.FakeATI >> 16);
+  snprintf(pciName, 15, "pci1002,%x", gSettings.FakeATI >> 16);
   val->type = kStr;
   val->size = 13;
   val->data = (UINT8 *)pciName;
@@ -2112,7 +2112,7 @@ BOOLEAN setup_ati_devprop(LOADER_ENTRY *Entry, pci_dt_t *ati_dev)
     FakeID = gSettings.FakeATI >> 16;
     devprop_add_value(card->device, "device-id", (UINT8*)&FakeID, 4);
     devprop_add_value(card->device, "ATY,DeviceID", (UINT8*)&FakeID, 2);
-    snprintf(compatible, 64, "pci1002,%04x", FakeID);
+    snprintf(compatible, 64, "pci1002,%x", FakeID);
     devprop_add_value(card->device, "@0,compatible", (UINT8*)&compatible[0], 12);
     FakeID = gSettings.FakeATI & 0xFFFF;
     devprop_add_value(card->device, "vendor-id", (UINT8*)&FakeID, 4);
diff --git a/rEFIt_UEFI/Platform/device_inject.cpp b/rEFIt_UEFI/Platform/device_inject.cpp
index 1818179f04..fc5652d7ef 100644
--- a/rEFIt_UEFI/Platform/device_inject.cpp
+++ b/rEFIt_UEFI/Platform/device_inject.cpp
@@ -408,7 +408,7 @@ BOOLEAN set_eth_props(pci_dt_t *eth_dev)
   if (gSettings.FakeLAN) {
     UINT32 FakeID = gSettings.FakeLAN >> 16;
     devprop_add_value(device, "device-id", (UINT8*)&FakeID, 4);
-    snprintf(compatible, 64, "pci%04x,%04x", (gSettings.FakeLAN & 0xFFFF), FakeID);
+    snprintf(compatible, 64, "pci%x,%x", (gSettings.FakeLAN & 0xFFFF), FakeID);
     devprop_add_value(device, "compatible", (UINT8*)&compatible[0], 12);
     FakeID = gSettings.FakeLAN & 0xFFFF;
     devprop_add_value(device, "vendor-id", (UINT8*)&FakeID, 4);
diff --git a/rEFIt_UEFI/refit/main.cpp b/rEFIt_UEFI/refit/main.cpp
index b038d19d85..8553adf954 100644
--- a/rEFIt_UEFI/refit/main.cpp
+++ b/rEFIt_UEFI/refit/main.cpp
@@ -2232,8 +2232,8 @@ RefitMain (IN EFI_HANDLE           ImageHandle,
     CHAR8           compatible[64];
     UINT32 FakeLAN = 0x0030168c;
     UINT32 FakeID = FakeLAN >> 16;
-    UINTN FakeVendor = FakeLAN & 0xFFFF;
-    snprintf(compatible, 64, "pci%04llx,%04x", FakeVendor, FakeID);
+    UINT32 FakeVendor = FakeLAN & 0xFFFF;
+    snprintf(compatible, 64, "pci%x,%x", FakeVendor, FakeID);
     DBG(" FakeLAN = 0x%x\n", FakeLAN);
     DBG(" Compatible=%s strlen=%ld sizeof=%ld iStrLen=%lld\n", compatible,
         strlen(compatible), sizeof(compatible), iStrLen(compatible, 64));