diff --git a/script/manifest/update_manifest_local_dev.sh b/script/manifest/update_manifest_local_dev.sh
index fdeccde..8b8c5f2 100755
--- a/script/manifest/update_manifest_local_dev.sh
+++ b/script/manifest/update_manifest_local_dev.sh
@@ -14,10 +14,16 @@ else
   MANIFEST_TARGET="$EL_MANIFEST_DEV"
 fi
 
+if command -v nproc >/dev/null 2>&1; then
+  JOBS="$(nproc --all)"
+else
+  JOBS="$(sysctl -n hw.ncpu)"
+fi
+
 # Generate local manifest
 .venv.erplibre/bin/python ./script/git/git_merge_repo_manifest.py --output .repo/local_manifests/erplibre_manifest.xml --with_OCA
 
 .venv.erplibre/bin/repo init -u git://127.0.0.1:9418/ -b $(git rev-parse --verify HEAD) -m ${MANIFEST_TARGET} "$@"
-.venv.erplibre/bin/repo sync -c -j $(nproc --all) -v -m ${MANIFEST_TARGET}
+.venv.erplibre/bin/repo sync -c -j "$JOBS" -v -m ${MANIFEST_TARGET}
 
 kill ${DAEMON_PID}
diff --git a/script/manifest/update_manifest_local_dev_code_generator.sh b/script/manifest/update_manifest_local_dev_code_generator.sh
index 0aa689e..ec52a82 100755
--- a/script/manifest/update_manifest_local_dev_code_generator.sh
+++ b/script/manifest/update_manifest_local_dev_code_generator.sh
@@ -15,7 +15,13 @@ else
   MANIFEST_TARGET="$EL_MANIFEST_DEV"
 fi
 
+if command -v nproc >/dev/null 2>&1; then
+  JOBS="$(nproc --all)"
+else
+  JOBS="$(sysctl -n hw.ncpu)"
+fi
+
 .venv.erplibre/bin/repo init -u git://127.0.0.1:9418/ -b $(git rev-parse --verify HEAD) -m ${MANIFEST_TARGET} -g base,code_generator
-.venv.erplibre/bin/repo sync -c -j $(nproc --all) -v -m ${MANIFEST_TARGET}
+.venv.erplibre/bin/repo sync -c -j "$JOBS" -v -m ${MANIFEST_TARGET}
 
 kill ${DAEMON_PID}
diff --git a/script/manifest/update_manifest_local_mobile.sh b/script/manifest/update_manifest_local_mobile.sh
index ece9d2e..32d588e 100755
--- a/script/manifest/update_manifest_local_mobile.sh
+++ b/script/manifest/update_manifest_local_mobile.sh
@@ -14,10 +14,16 @@ else
   MANIFEST_TARGET="$EL_MANIFEST_DEV"
 fi
 
+if command -v nproc >/dev/null 2>&1; then
+  JOBS="$(nproc --all)"
+else
+  JOBS="$(sysctl -n hw.ncpu)"
+fi
+
 # Generate local manifest
 .venv.erplibre/bin/python ./script/git/git_merge_repo_manifest.py --output .repo/local_manifests/erplibre_manifest.xml --with_mobile
 
 .venv.erplibre/bin/repo init -u git://127.0.0.1:9418/ -b $(git rev-parse --verify HEAD) -m ${MANIFEST_TARGET} "$@"
-.venv.erplibre/bin/repo sync -c -j $(nproc --all) -v -m ${MANIFEST_TARGET}
+.venv.erplibre/bin/repo sync -c -j "$JOBS" -v -m ${MANIFEST_TARGET}
 
 kill ${DAEMON_PID}
diff --git a/script/manifest/update_manifest_local_prod.sh b/script/manifest/update_manifest_local_prod.sh
index c5a962a..66c029a 100755
--- a/script/manifest/update_manifest_local_prod.sh
+++ b/script/manifest/update_manifest_local_prod.sh
@@ -15,7 +15,13 @@ else
   MANIFEST_TARGET="$EL_MANIFEST_DEV"
 fi
 
+if command -v nproc >/dev/null 2>&1; then
+  JOBS="$(nproc --all)"
+else
+  JOBS="$(sysctl -n hw.ncpu)"
+fi
+
 .venv.erplibre/bin/repo init -u git://127.0.0.1:9418/ -b $(git rev-parse --verify HEAD) -m ${MANIFEST_TARGET}
-.venv.erplibre/bin/repo sync -c -j $(nproc --all) -v -m ${MANIFEST_TARGET}
+.venv.erplibre/bin/repo sync -c -j "$JOBS" -v -m ${MANIFEST_TARGET}
 
 kill ${DAEMON_PID}
diff --git a/script/manifest/update_manifest_prod.sh b/script/manifest/update_manifest_prod.sh
index c2f8755..4a8e8e2 100755
--- a/script/manifest/update_manifest_prod.sh
+++ b/script/manifest/update_manifest_prod.sh
@@ -5,6 +5,12 @@
 #EL_MANIFEST_PROD="./default.xml"
 #EL_MANIFEST_DEV="./manifest/default.dev.xml"
 
+if command -v nproc >/dev/null 2>&1; then
+  JOBS="$(nproc --all)"
+else
+  JOBS="$(sysctl -n hw.ncpu)"
+fi
+
 # Update git-repo
 .venv.erplibre/bin/repo init -u https://github.com/ERPLibre/ERPLibre -b $(git rev-parse --verify HEAD)
-.venv.erplibre/bin/repo sync -v -j $(nproc --all)
+.venv.erplibre/bin/repo sync -v -j "$JOBS"