diff --git a/cmake_targets/tools/build_epc b/cmake_targets/tools/build_epc
index 5eb6b3ee960db9d74ad16c678d94a0235fd17db0..7acb06e5a0f3a99e18e5bbb4c9fa51a47cc8b5ca 100755
--- a/cmake_targets/tools/build_epc
+++ b/cmake_targets/tools/build_epc
@@ -213,8 +213,8 @@ function main()
     $SUDO rm -f /usr/etc/freeDiameter/mme*    2>&1
     $SUDO rm -f /usr/etc/freeDiameter/epc*    2>&1
     $SUDO rm -f $OPENAIR_DIR/targets/bin/xt_GTPU*.ko    2>&1
-    ($SUDO cd $OPENAIRCN_DIR/GTPV1-U/GTPUAH && make clean)
-    ($SUDO cd $OPENAIRCN_DIR/GTPV1-U/GTPURH && make clean)
+    (cd $OPENAIRCN_DIR/GTPV1-U/GTPUAH && $SUDO make clean)
+    (cd $OPENAIRCN_DIR/GTPV1-U/GTPURH && $SUDO make clean)
     $SUDO rm -f $OPENAIRCN_DIR/GTPV1-U/GTPUAH/Bin/* 2>&1
     $SUDO rm -f /lib/xtables/libxt_GTPU*.so             2>&1
     mkdir -m 777 -p -v build