diff --git a/configure.ac b/configure.ac
index 4ac778547..961a8e4ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -202,9 +202,9 @@ then
         AC_MSG_ERROR([Your compiler does not accept C99.])
 fi
 
-AC_CHECK_SIZEOF([int *])
+AC_CHECK_SIZEOF([size_t])
 
-if test $ac_cv_sizeof_int_p -eq 8
+if test $ac_cv_sizeof_size_t -eq 8
 then
         WORD_LEN=64
 else
diff --git a/src/video_codec.c b/src/video_codec.c
index c2106e7b4..7e6cb35a0 100644
--- a/src/video_codec.c
+++ b/src/video_codec.c
@@ -507,6 +507,7 @@ void vc_copylinev210(unsigned char *dst, const unsigned char *src, int dst_len)
  */
 void vc_copylineYUYV(unsigned char *dst, const unsigned char *src, int dst_len)
 {
+#if WORD_LEN == 64
         register uint32_t *d;
         register const uint32_t *s;
         const uint32_t * const end = (uint32_t *)(void *) dst + dst_len / 4;
@@ -549,6 +550,20 @@ void vc_copylineYUYV(unsigned char *dst, const unsigned char *src, int dst_len)
 
                 }
         }
+#else
+	char u, y1, v, y2;
+	while (dst_len > 0) {
+		y1 = *src++;
+		u = *src++;
+		y2 = *src++;
+		v = *src++;
+		*dst++ = u;
+		*dst++ = y1;
+		*dst++ = v;
+		*dst++ = y2;
+		dst_len -= 4;
+	}
+#endif
 }
 
 /**