diff --git a/vulkan/libvulkan/driver.cpp b/vulkan/libvulkan/driver.cpp
index 7ea98f5..3f89960 100644
--- a/vulkan/libvulkan/driver.cpp
+++ b/vulkan/libvulkan/driver.cpp
@@ -964,14 +964,20 @@
 
 PFN_vkVoidFunction GetDeviceProcAddr(VkDevice device, const char* pName) {
     const ProcHook* hook = GetProcHook(pName);
+    PFN_vkVoidFunction drv_func = GetData(device).driver.GetDeviceProcAddr(device, pName);
+
     if (!hook)
-        return GetData(device).driver.GetDeviceProcAddr(device, pName);
+        return drv_func;
 
     if (hook->type != ProcHook::DEVICE) {
         ALOGE("internal vkGetDeviceProcAddr called for %s", pName);
         return nullptr;
     }
 
+    // Don't hook if we don't have a device entry function below for the core function.
+    if (!drv_func && (hook->extension >= ProcHook::EXTENSION_CORE_1_0))
+        return nullptr;
+
     return (GetData(device).hook_extensions[hook->extension]) ? hook->proc
                                                               : nullptr;
 }
diff --git a/vulkan/scripts/driver_generator.py b/vulkan/scripts/driver_generator.py
index 78b550c..48c0ae9 100644
--- a/vulkan/scripts/driver_generator.py
+++ b/vulkan/scripts/driver_generator.py
@@ -239,6 +239,8 @@
       f.write(gencom.indent(2) + gencom.base_ext_name(ext) + ',\n')
 
     f.write('\n')
+    # EXTENSION_CORE_xxx API list must be the last set of enums after the extensions.
+    # This allows to easily identify "a" core function hook
     for version in gencom.version_code_list:
       f.write(gencom.indent(2) + 'EXTENSION_CORE_' + version + ',\n')