diff --git a/include/lattice.h b/include/lattice.h
index 33d2ac3df3e13034db004a7aa4637e68841a721f..75729b605ab6a90dc49fc61930fe33ada2ea4db9 100755
--- a/include/lattice.h
+++ b/include/lattice.h
@@ -308,6 +308,7 @@ int lattice_info(Lattice_desc *desc);
 
 void ispVMStart(void);
 void ispVMEnd(void);
+extern void ispVMFreeMem(void);
 signed char ispVMCode(void);
 void ispVMDelay(unsigned short int a_usMicroSecondDelay);
 void ispVMCalculateCRC32(unsigned char a_ucData);