diff --git a/Makefile.def b/Makefile.def
index 34f7df3..05dc86c 100644
--- a/Makefile.def
+++ b/Makefile.def
@@ -155,7 +155,7 @@ dist_lc3sim-tk: lc3sim-tk
 
 lc3sim-tk: lc3sim-tk.def
 	${SED} -e 's @@WISH@@ ${WISH} g' \
-		-e 's*@@LC3_SIM@@*"${INSTALL_DIR}/lc3sim"*g' \
+		-e 's*@@LC3_SIM@@*"${INSTALL_DIR}/bin/lc3sim"*g' \
 		-e 's!@@CODE_FONT@@!${CODE_FONT}!g' \
 		-e 's!@@BUTTON_FONT@@!${BUTTON_FONT}!g' \
 		-e 's!@@CONSOLE_FONT@@!${CONSOLE_FONT}!g' \