diff --git a/src/Makefile b/src/Makefile
index 2122b007..8425760e 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -27,6 +27,12 @@ util.o : util.cpp include/types.h include/util.h
 mem.o : mem.cpp include/types.h include/util.h include/mem.h
 core.o : core.cpp include/types.h include/util.h include/mem.h include/archdef.h
 
+QSIM_CXXFLAGS=-DEMU_INSTRUMENTATION
+
+qsim-harp.so: args.cpp enc.cpp instruction.cpp obj.cpp util.cpp mem.cpp core.cpp qsim-harp.cpp include/qsim-harp.h include/types.h include/core.h include/util.h include/enc.h include/archdef.h include/instruction.h include/asm-tokens.h include/mem.h
+	$(CXX) $(CXXFLAGS) $(QSIM_CXXFLAGS) -shared -o $@ args.cpp enc.cpp instruction.cpp obj.cpp util.cpp mem.cpp core.cpp qsim-harp.cpp
+
+
 lex.yy.cc: scanner.lex
 	flex scanner.lex