diff --git mpeg2dec/configure.ac mpeg2dec/configure.ac
index 9f4831e..fd4196f 100644
--- mpeg2dec/configure.ac
+++ mpeg2dec/configure.ac
@@ -142,7 +142,6 @@ AC_CHECK_GENERATE_INTTYPES([include])
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
-AC_C_ALWAYS_INLINE
 AC_C_RESTRICT
 AC_C_BUILTIN_EXPECT
 AC_C_BIGENDIAN