diff --git a/include/ftimage.h b/include/ftimage.h
index ea71a78e..0ada3abe 100644
--- a/include/ftimage.h
+++ b/include/ftimage.h
@@ -55,7 +55,11 @@ FT_BEGIN_HEADER
   /*    on the context, these can represent distances in integer font      */
   /*    units, or 16.16, or 26.6 fixed-point pixel coordinates.            */
   /*                                                                       */
-  typedef signed long  FT_Pos;
+  #ifdef _WIN64
+    typedef signed __int64  FT_Pos;
+  #else
+    typedef signed long  FT_Pos;
+  #endif
 
 
   /*************************************************************************/
diff --git a/include/fttypes.h b/include/fttypes.h
index bd944a49..618dc37c 100644
--- a/include/fttypes.h
+++ b/include/fttypes.h
@@ -235,7 +235,11 @@ FT_BEGIN_HEADER
   /* <Description>                                                         */
   /*    A typedef for signed long.                                         */
   /*                                                                       */
-  typedef signed long  FT_Long;
+  #ifdef _WIN64
+    typedef signed __int64  FT_Long;
+  #else
+    typedef signed long  FT_Long;
+  #endif
 
 
   /*************************************************************************/
@@ -246,7 +250,11 @@ FT_BEGIN_HEADER
   /* <Description>                                                         */
   /*    A typedef for unsigned long.                                       */
   /*                                                                       */
-  typedef unsigned long  FT_ULong;
+  #ifdef _WIN64
+    typedef unsigned __int64  FT_ULong;
+  #else
+    typedef unsigned long  FT_ULong;
+  #endif
 
 
   /*************************************************************************/
@@ -269,7 +277,11 @@ FT_BEGIN_HEADER
   /*    A signed 26.6 fixed-point type used for vectorial pixel            */
   /*    coordinates.                                                       */
   /*                                                                       */
-  typedef signed long  FT_F26Dot6;
+  #ifdef _WIN64
+    typedef signed __int64  FT_F26Dot6;
+  #else
+    typedef signed long  FT_F26Dot6;
+  #endif
 
 
   /*************************************************************************/
@@ -281,7 +293,11 @@ FT_BEGIN_HEADER
   /*    This type is used to store 16.16 fixed-point values, like scaling  */
   /*    values or matrix coefficients.                                     */
   /*                                                                       */
-  typedef signed long  FT_Fixed;
+  #ifdef _WIN64
+    typedef signed __int64  FT_Fixed;
+  #else
+    typedef signed long  FT_Fixed;
+  #endif
 
 
   /*************************************************************************/