diff --git a/src/hb-open-file.hh b/src/hb-open-file.hh
index de22ed55d..32a223cdf 100644
--- a/src/hb-open-file.hh
+++ b/src/hb-open-file.hh
@@ -154,7 +154,8 @@ typedef struct OffsetTable
       c->align (4);
       const char *end = (const char *) c->head;
 
-      if (items[i].tag == HB_OT_TAG_head && end - start >= head::static_size)
+      if (items[i].tag == HB_OT_TAG_head &&
+	  (unsigned) (end - start) >= head::static_size)
       {
 	head *h = (head *) start;
 	checksum_adjustment = &h->checkSumAdjustment;
diff --git a/src/hb-ot-color-cbdt-table.hh b/src/hb-ot-color-cbdt-table.hh
index 71c31aff8..333ceaaba 100644
--- a/src/hb-ot-color-cbdt-table.hh
+++ b/src/hb-ot-color-cbdt-table.hh
@@ -56,7 +56,7 @@ struct SmallGlyphMetrics
     extents->x_bearing = bearingX;
     extents->y_bearing = bearingY;
     extents->width = width;
-    extents->height = -height;
+    extents->height = - (hb_position_t) height;
   }
 
   HBUINT8	height;
diff --git a/src/hb-uniscribe.cc b/src/hb-uniscribe.cc
index 8e9fda269..31c50dfeb 100644
--- a/src/hb-uniscribe.cc
+++ b/src/hb-uniscribe.cc
@@ -215,9 +215,12 @@ struct hb_uniscribe_shaper_funcs_t
     hinstLib = GetModuleHandle (TEXT ("usp10.dll"));
     if (hinstLib)
     {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-function-type"
       this->ScriptItemizeOpenType = (SIOT) GetProcAddress (hinstLib, "ScriptItemizeOpenType");
       this->ScriptShapeOpenType   = (SSOT) GetProcAddress (hinstLib, "ScriptShapeOpenType");
       this->ScriptPlaceOpenType   = (SPOT) GetProcAddress (hinstLib, "ScriptPlaceOpenType");
+#pragma GCC diagnostic pop
     }
     if (!this->ScriptItemizeOpenType ||
 	!this->ScriptShapeOpenType   ||
diff --git a/src/hb.hh b/src/hb.hh
index 556e9171c..eb941bea4 100644
--- a/src/hb.hh
+++ b/src/hb.hh
@@ -30,6 +30,9 @@
 #define HB_HH
 
 #ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC
+#if defined(_MSC_VER)
+#pragma warning( disable: 4068 ) /* Unknown pragma */
+#endif
 #if defined(__GNUC__) || defined(__clang__)
 /* Rules:
  *