diff --git a/dlls/wined3d/utils.c b/dlls/wined3d/utils.c
index aa68799535e..f8da256b07e 100644
--- a/dlls/wined3d/utils.c
+++ b/dlls/wined3d/utils.c
@@ -3971,7 +3971,7 @@ static void init_format_depth_bias_scale(struct wined3d_adapter *adapter,
     }
 }
 
-BOOL wined3d_adapter_init_format_info(struct wined3d_adapter *adapter, size_t format_size)
+static BOOL wined3d_adapter_init_format_info(struct wined3d_adapter *adapter, size_t format_size)
 {
     unsigned int count = WINED3D_FORMAT_COUNT + ARRAY_SIZE(typeless_depth_stencil_formats);
 
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 5a6715a5906..6e39db4fa86 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -2707,7 +2707,6 @@ struct wined3d_caps_gl_ctx
     GLuint test_program_id;
 };
 
-BOOL wined3d_adapter_init_format_info(struct wined3d_adapter *adapter, size_t format_size) DECLSPEC_HIDDEN;
 BOOL wined3d_adapter_gl_init_format_info(struct wined3d_adapter *adapter,
         struct wined3d_caps_gl_ctx *ctx) DECLSPEC_HIDDEN;
 BOOL wined3d_adapter_no3d_init_format_info(struct wined3d_adapter *adapter) DECLSPEC_HIDDEN;