diff --git a/dlls/d3d10/d3d10_main.c b/dlls/d3d10/d3d10_main.c
index e3d1c57e448..a54c44bdbb9 100644
--- a/dlls/d3d10/d3d10_main.c
+++ b/dlls/d3d10/d3d10_main.c
@@ -24,6 +24,25 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(d3d10);
 
+#define WINE_D3D10_TO_STR(x) case x: return #x
+
+static const char *debug_d3d10_driver_type(D3D10_DRIVER_TYPE driver_type)
+{
+    switch (driver_type)
+    {
+        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_HARDWARE);
+        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_REFERENCE);
+        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_NULL);
+        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_SOFTWARE);
+        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_WARP);
+        default:
+            FIXME("Unrecognised D3D10_DRIVER_TYPE %#x.\n", driver_type);
+            return "unrecognised";
+    }
+}
+
+#undef WINE_D3D10_TO_STR
+
 static HRESULT d3d10_create_device(IDXGIAdapter *adapter, D3D10_DRIVER_TYPE driver_type,
         HMODULE swrast, UINT flags, UINT sdk_version, ID3D10Device **device)
 {
diff --git a/dlls/d3d10/d3d10_private.h b/dlls/d3d10/d3d10_private.h
index c9e6dbb8232..1deba9c8601 100644
--- a/dlls/d3d10/d3d10_private.h
+++ b/dlls/d3d10/d3d10_private.h
@@ -41,7 +41,6 @@
 #define D3DERR_INVALIDCALL 0x8876086c
 
 /* TRACE helper functions */
-const char *debug_d3d10_driver_type(D3D10_DRIVER_TYPE driver_type) DECLSPEC_HIDDEN;
 const char *debug_d3d10_device_state_types(D3D10_DEVICE_STATE_TYPES t) DECLSPEC_HIDDEN;
 
 enum d3d10_effect_object_type
diff --git a/dlls/d3d10/utils.c b/dlls/d3d10/utils.c
index fca8994ff2e..680a11f37e2 100644
--- a/dlls/d3d10/utils.c
+++ b/dlls/d3d10/utils.c
@@ -23,21 +23,6 @@ WINE_DEFAULT_DEBUG_CHANNEL(d3d10);
 
 #define WINE_D3D10_TO_STR(x) case x: return #x
 
-const char *debug_d3d10_driver_type(D3D10_DRIVER_TYPE driver_type)
-{
-    switch(driver_type)
-    {
-        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_HARDWARE);
-        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_REFERENCE);
-        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_NULL);
-        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_SOFTWARE);
-        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_WARP);
-        default:
-            FIXME("Unrecognized D3D10_DRIVER_TYPE %#x\n", driver_type);
-            return "unrecognized";
-    }
-}
-
 const char *debug_d3d10_device_state_types(D3D10_DEVICE_STATE_TYPES t)
 {
     switch (t)