diff --git a/dlls/d3dcompiler_43/compiler.c b/dlls/d3dcompiler_43/compiler.c
index 6a829ae43d7..6fffcfb82ab 100644
--- a/dlls/d3dcompiler_43/compiler.c
+++ b/dlls/d3dcompiler_43/compiler.c
@@ -457,7 +457,7 @@ HRESULT WINAPI D3DCompile2(const void *data, SIZE_T data_size, const char *filen
     struct d3dcompiler_include_from_file include_from_file;
     struct vkd3d_shader_preprocess_info preprocess_info;
     struct vkd3d_shader_hlsl_source_info hlsl_info;
-    struct vkd3d_shader_compile_option options[5];
+    struct vkd3d_shader_compile_option options[6];
     struct vkd3d_shader_compile_info compile_info;
     struct vkd3d_shader_compile_option *option;
     struct vkd3d_shader_code byte_code;
@@ -485,8 +485,8 @@ HRESULT WINAPI D3DCompile2(const void *data, SIZE_T data_size, const char *filen
     {
         FIXME("Ignoring flags %#x.\n", flags);
     }
-    if (effect_flags)
-        FIXME("Ignoring effect flags %#x.\n", effect_flags);
+    if (effect_flags & ~D3DCOMPILE_EFFECT_CHILD_EFFECT)
+        FIXME("Ignoring effect flags %#x.\n", effect_flags & ~D3DCOMPILE_EFFECT_CHILD_EFFECT);
     if (secondary_flags)
         FIXME("Ignoring secondary flags %#x.\n", secondary_flags);
 
@@ -557,6 +557,13 @@ HRESULT WINAPI D3DCompile2(const void *data, SIZE_T data_size, const char *filen
         option->value = VKD3D_SHADER_COMPILE_OPTION_BACKCOMPAT_MAP_SEMANTIC_NAMES;
     }
 
+    if (effect_flags & D3DCOMPILE_EFFECT_CHILD_EFFECT)
+    {
+        option = &options[compile_info.option_count++];
+        option->name = VKD3D_SHADER_COMPILE_OPTION_CHILD_EFFECT;
+        option->value = true;
+    }
+
 #if D3D_COMPILER_VERSION <= 39
     option = &options[compile_info.option_count++];
     option->name = VKD3D_SHADER_COMPILE_OPTION_INCLUDE_EMPTY_BUFFERS_IN_EFFECTS;