diff --git a/scripts/compile_ocaml.sh b/scripts/compile_ocaml.sh
index a28ce68..47045d8 100755
--- a/scripts/compile_ocaml.sh
+++ b/scripts/compile_ocaml.sh
@@ -8,4 +8,4 @@ fi
 
 cd ${QMCCHEM_PATH}/ocaml || exit -1
 
-exec ninja -f generated.ninja ${@}
+ninja ${@} || exit -1
diff --git a/scripts/compile_ocaml_dep.sh b/scripts/compile_ocaml_dep.sh
index 519175a..ce7f610 100755
--- a/scripts/compile_ocaml_dep.sh
+++ b/scripts/compile_ocaml_dep.sh
@@ -25,7 +25,7 @@ if [[ ${MD5} != ${REF} ]]
 then
   echo ${MD5} > ${LSMD5_FILE}
   echo Finding dependencies in OCaml files
-  exec python ./ninja_ocaml.py
+  python ./ninja_ocaml.py || exit -1
 fi