diff --git a/Makefile b/Makefile
index 1c92147cb..ebf225d62 100644
--- a/Makefile
+++ b/Makefile
@@ -32,7 +32,7 @@ prefix ?= $(DESTDIR)/usr
 endif
 
 ifndef NOPARALLEL
-export MAKEFLAGS+=" -j$(( $(nproc) + 1)) "
+export MAKEFLAGS+=" -j$$(( $$(nproc 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null || echo 8) + 1)) "
 endif
 
 debug install-debug uninstall-debug test-debug: build ?= debug
diff --git a/deps.mk b/deps.mk
index fe68ccddc..334818d4a 100644
--- a/deps.mk
+++ b/deps.mk
@@ -4,7 +4,7 @@ rime_root = $(CURDIR)
 src_dir = $(rime_root)/deps
 
 ifndef NOPARALLEL
-export MAKEFLAGS+=" -j$(( $(nproc) + 1)) "
+export MAKEFLAGS+=" -j$$(( $$(nproc 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null || echo 8) + 1)) "
 endif
 
 build ?= build