diff --git a/include/freetype/config/integer-types.h b/include/freetype/config/integer-types.h
index b772845..d9d2638 100644
--- a/include/freetype/config/integer-types.h
+++ b/include/freetype/config/integer-types.h
@@ -221,9 +221,10 @@
 #define FT_INT64   __int64
 #define FT_UINT64  unsigned __int64
 
-#elif defined( __WATCOMC__ )   /* Watcom C++ */
+#elif defined( __WATCOMC__ ) && __WATCOMC__ >= 1100  /* Watcom C++ */
 
-  /* Watcom doesn't provide 64-bit data types */
+#define FT_INT64   long long int
+#define FT_UINT64  unsigned long long int
 
 #elif defined( __MWERKS__ )    /* Metrowerks CodeWarrior */
 
diff --git a/include/freetype/internal/ftcalc.h b/include/freetype/internal/ftcalc.h
index 46e7f22..e6a87db 100644
--- a/include/freetype/internal/ftcalc.h
+++ b/include/freetype/internal/ftcalc.h
@@ -408,6 +408,19 @@
 
 #endif
 
+#elif defined( __WATCOMC__ ) && defined( __386__ )
+
+  extern __inline FT_Int32
+  FT_MSB_i386( FT_UInt32  x );
+
+#pragma aux FT_MSB_i386 =     \
+  "bsr eax, eax"              \
+  parm [eax] nomemory         \
+  value [eax]                 \
+  modify exact [eax] nomemory;
+
+#define FT_MSB( x )  FT_MSB_i386( x )
+
 #elif defined( __DECC ) || defined( __DECCXX )
 
 #include <builtins.h>