diff --git a/src/include/instruction.h b/src/include/instruction.h
index 46379abd..ed24eeab 100644
--- a/src/include/instruction.h
+++ b/src/include/instruction.h
@@ -30,10 +30,10 @@ namespace Harp {
                   JALI, JALR, JMPI, JMPR, CLONE, JALIS, JALRS, 
                   JMPRT, LD, ST, LDI, RTOP, ANDP, ORP, XORP, NOTP, ISNEG, 
                   ISZERO, HALT, TRAP, JMPRU, SKEP, RETI, TLBRM,
-                  ITOF, FTOI, FADD, FSUB, FMUL, FDIV, FNEG };
+                  ITOF, FTOI, FADD, FSUB, FMUL, FDIV, FNEG, WSPAWN };
     enum ArgClass {
       AC_NONE, AC_2REG, AC_2IMM, AC_3REG, AC_3PREG, AC_3IMM, AC_3REGSRC, 
-      AC_1IMM, AC_1REG, AC_3IMMSRC, AC_PREG_REG, AC_2PREG
+      AC_1IMM, AC_1REG, AC_3IMMSRC, AC_PREG_REG, AC_2PREG, AC_2REGSRC
     };
     enum InstType {
       ITYPE_NULL, ITYPE_INTBASIC, ITYPE_INTMUL, ITYPE_INTDIV, ITYPE_STACK, ITYPE_BR, 
diff --git a/src/instruction.cpp b/src/instruction.cpp
index 6b551c1a..61ec008e 100644
--- a/src/instruction.cpp
+++ b/src/instruction.cpp
@@ -80,6 +80,7 @@ Instruction::InstTableEntry Instruction::instTable[] = {
   {"fmul",     false, false, false, false, AC_3REG,     ITYPE_FPMUL   },
   {"fdiv",     false, false, false, false, AC_3REG,     ITYPE_FPDIV   },
   {"fneg",     false, false, false, false, AC_2REG,     ITYPE_FPBASIC },
+  {"wspawn",   false, false, true,  false, AC_2REGSRC,  ITYPE_NULL    },
   {NULL,false,false,false,false,AC_NONE,ITYPE_NULL}/////// End of table.
 };