diff --git a/src/hb-uniscribe.cc b/src/hb-uniscribe.cc
index 2f01c28..93bce52 100644
--- a/src/hb-uniscribe.cc
+++ b/src/hb-uniscribe.cc
@@ -240,6 +240,11 @@ _hb_uniscribe_shape (hb_shape_plan_t    *shape_plan,
   hb_face_t *face = font->face;
   hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
   hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
+  SIOT siot;
+  SSOT ssot;
+  SPOT spot;
+  HINSTANCE hinstLib = LoadLibrary("usp10.dll");
+    
 
 #define FAIL(...) \
   HB_STMT_START { \
@@ -249,6 +254,21 @@ _hb_uniscribe_shape (hb_shape_plan_t    *shape_plan,
 
   HRESULT hr;
 
+  if (hinstLib == NULL)
+    FAIL ("LoadLibrary(\"usp10.dll\") failed:", NULL);
+  
+  siot = (SIOT)GetProcAddress(hinstLib, "ScriptItemizeOpenType");
+  if (siot == NULL)
+    FAIL ("GetProcAddress(\"ScriptItemizeOpenType\") failed:", NULL);
+  
+  ssot = (SSOT)GetProcAddress(hinstLib, "ScriptShapeOpenType");
+  if (ssot == NULL)
+    FAIL ("GetProcAddress(\"ScriptShapeOpenType\") failed:", NULL);
+  
+  spot = (SPOT)GetProcAddress(hinstLib, "ScriptPlaceOpenType");
+  if (ssot == NULL)
+    FAIL ("GetProcAddress(\"ScriptPlaceOpenType\") failed:", NULL);
+  
 retry:
 
   unsigned int scratch_size;
@@ -312,7 +332,7 @@ retry:
   bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
   bidi_state.fOverrideDirection = 1;
 
-  hr = ScriptItemizeOpenType (wchars,
+  hr = siot (wchars,
 			      chars_len,
 			      MAX_ITEMS,
 			      &bidi_control,
@@ -344,7 +364,7 @@ retry:
     unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset;
 
   retry_shape:
-    hr = ScriptShapeOpenType (font_data->hdc,
+    hr = ssot (font_data->hdc,
 			      &font_data->script_cache,
 			      &items[i].a,
 			      script_tags[i],
@@ -386,7 +406,7 @@ retry:
     for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++)
       log_clusters[j] += glyphs_offset;
 
-    hr = ScriptPlaceOpenType (font_data->hdc,
+    hr = spot (font_data->hdc,
 			      &font_data->script_cache,
 			      &items[i].a,
 			      script_tags[i],
diff --git a/src/hb-uniscribe.h b/src/hb-uniscribe.h
index 51887c8..b7e55e2 100644
--- a/src/hb-uniscribe.h
+++ b/src/hb-uniscribe.h
@@ -33,6 +33,11 @@
 #define _WIN32_WINNT 0x0600
 #endif
 #include <windows.h>
+#include <usp10.h>
+
+typedef HRESULT WINAPI (*SIOT)(const WCHAR*,int,int,const SCRIPT_CONTROL*,const SCRIPT_STATE*,SCRIPT_ITEM*,OPENTYPE_TAG*,int*);
+typedef HRESULT WINAPI (*SSOT)(HDC,SCRIPT_CACHE*,SCRIPT_ANALYSIS*,OPENTYPE_TAG,OPENTYPE_TAG,int*,TEXTRANGE_PROPERTIES**,int,const WCHAR*,int,int,WORD*,SCRIPT_CHARPROP*,WORD*,SCRIPT_GLYPHPROP*,int*);
+typedef HRESULT WINAPI (*SPOT)(HDC,SCRIPT_CACHE*,SCRIPT_ANALYSIS*,OPENTYPE_TAG,OPENTYPE_TAG,int*,TEXTRANGE_PROPERTIES**,int,const WCHAR*,const WORD*,const SCRIPT_CHARPROP*,int,const WORD*,const SCRIPT_GLYPHPROP*,int,int*,GOFFSET*,ABC*);
 
 HB_BEGIN_DECLS