diff --git a/dlls/dwrite/dwrite_private.h b/dlls/dwrite/dwrite_private.h
index 907a1c3402c..522776207dd 100644
--- a/dlls/dwrite/dwrite_private.h
+++ b/dlls/dwrite/dwrite_private.h
@@ -142,7 +142,6 @@ struct glyph_outline {
 };
 
 extern HRESULT new_glyph_outline(UINT32,struct glyph_outline**) DECLSPEC_HIDDEN;
-extern void    free_glyph_outline(struct glyph_outline*) DECLSPEC_HIDDEN;
 
 /* FreeType integration */
 extern BOOL init_freetype(void) DECLSPEC_HIDDEN;
diff --git a/dlls/dwrite/font.c b/dlls/dwrite/font.c
index 80b7f073cf2..d0c109d1ad6 100644
--- a/dlls/dwrite/font.c
+++ b/dlls/dwrite/font.c
@@ -451,7 +451,7 @@ HRESULT new_glyph_outline(UINT32 count, struct glyph_outline **ret)
     return S_OK;
 }
 
-void free_glyph_outline(struct glyph_outline *outline)
+static void free_glyph_outline(struct glyph_outline *outline)
 {
     heap_free(outline->points);
     heap_free(outline->tags);