diff --git a/src/USER-ATC/Install.sh b/src/USER-ATC/Install.sh
index 9e74cfee96..03ec562a6a 100755
--- a/src/USER-ATC/Install.sh
+++ b/src/USER-ATC/Install.sh
@@ -34,7 +34,7 @@ if (test $1 = 1) then
 
   if (test -e ../Makefile.package) then
     sed -i -e 's/[^ \t]*atc[^ \t]* //' ../Makefile.package
-    sed -i -e 's|^PKG_INC =[ \t]*|&-I../../lib/atc -I../../src |' ../Makefile.package
+    sed -i -e 's|^PKG_INC =[ \t]*|&-I../../lib/atc |' ../Makefile.package
     sed -i -e 's|^PKG_PATH =[ \t]*|&-L../../lib/atc |' ../Makefile.package
 
 #   sed -i -e 's|^PKG_INC =[ \t]*|&-I../../lib/atc |' ../Makefile.package