diff --git a/src/libs/udis86/decode.c b/src/libs/udis86/decode.c
index 70fa9adf50..d9daa7d8d8 100644
--- a/src/libs/udis86/decode.c
+++ b/src/libs/udis86/decode.c
@@ -13,6 +13,7 @@
 #include "itab.h"
 #include "input.h"
 #include "decode.h"
+#include "extern.h"
 
 /* The max number of prefixes to an instruction */
 #define MAX_PREFIXES    15