diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index dbcdb4c387..e994d32d96 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -886,6 +886,7 @@
 /* SUBTRACT HALFWORD */
     C(0x4b00, SH,      RX_a,  Z,   r1, m2_16s, new, r1_32, sub, subs32)
     C(0xe37b, SHY,     RXY_a, LD,  r1, m2_16s, new, r1_32, sub, subs32)
+    C(0xe339, SGH,     RXY_a, MIE2,r1, m2_16s, r1, 0, sub, subs64)
 /* SUBTRACT HIGH */
     C(0xb9c9, SHHHR,   RRF_a, HW,  r2_sr32, r3_sr32, new, r1_32h, sub, subs32)
     C(0xb9d9, SHHLR,   RRF_a, HW,  r2_sr32, r3, new, r1_32h, sub, subs32)