diff --git a/lefdef/src/def/def/CMakeLists.txt b/lefdef/src/def/def/CMakeLists.txt
index 78d9b300..f35b4595 100644
--- a/lefdef/src/def/def/CMakeLists.txt
+++ b/lefdef/src/def/def/CMakeLists.txt
@@ -81,7 +81,7 @@
           add_custom_command ( OUTPUT   def.tab.cpp
                                DEPENDS  ${DefParserGrammar}
                                COMMAND  ${BISON_EXECUTABLE} -v -p defyy -d ${DefParserGrammar} -o def.tab.cpp 
-                              #COMMAND  mv def.tab.hpp ${LEFDEF_SOURCE_DIR}/src/def/def/def.tab.h
+                               COMMAND  ln -s def.tab.hpp def.tab.h
                               #COMMAND  mv def.tab.cpp ${LEFDEF_SOURCE_DIR}/src/def/def/def.tab.cpp
                                COMMENT  "Generating DEF parser (bison)"
                              )
diff --git a/lefdef/src/lef/lef/CMakeLists.txt b/lefdef/src/lef/lef/CMakeLists.txt
index 16e25ad0..565d4b39 100644
--- a/lefdef/src/lef/lef/CMakeLists.txt
+++ b/lefdef/src/lef/lef/CMakeLists.txt
@@ -61,7 +61,7 @@
           add_custom_command ( OUTPUT   lef.tab.cpp
                                DEPENDS  ${LefParserGrammar}
                                COMMAND  ${BISON_EXECUTABLE} -v -p lefyy -d ${LefParserGrammar} -o lef.tab.cpp 
-                              #COMMAND  mv lef.tab.hpp ${LEFDEF_SOURCE_DIR}/src/lef/lef/lef.tab.h
+                               COMMAND  ln -s lef.tab.hpp lef.tab.h
                               #COMMAND  mv lef.tab.cpp ${LEFDEF_SOURCE_DIR}/src/lef/lef/lef.tab.cpp
                                COMMENT  "Generating LEF parser (bison)"
                              )