diff --git a/qemu/target/mips/translate.c b/qemu/target/mips/translate.c
index bca3fb32..7d2e233b 100644
--- a/qemu/target/mips/translate.c
+++ b/qemu/target/mips/translate.c
@@ -24131,6 +24131,12 @@ static void decode_opc_special(CPUMIPSState *env, DisasContext *ctx)
 #define MXU_APTN1_A    0
 #define MXU_APTN1_S    1
 
+/* MXU execute add/subtract 2-bit pattern 'eptn2' */
+#define MXU_EPTN2_AA    0
+#define MXU_EPTN2_AS    1
+#define MXU_EPTN2_SA    2
+#define MXU_EPTN2_SS    3
+
 /*
  *
  * Decode MXU pool00