diff --git a/liblzma-sys/config.h b/liblzma-sys/config.h
index 9e3e9d69..c5a4fc0d 100644
--- a/liblzma-sys/config.h
+++ b/liblzma-sys/config.h
@@ -14,6 +14,8 @@
 #define HAVE_ENCODER_LZ 1
 #define HAVE_DECODER_DELTA 1
 #define HAVE_ENCODER_DELTA 1
+#define HAVE_DECODER_IA64 1
+#define HAVE_ENCODER_IA64 1
 #define HAVE_DECODER_SPARC 1
 #define HAVE_ENCODER_SPARC 1
 #define HAVE_DECODER_X86 1