diff --git a/bashrc b/bashrc
index 7daa19ea..62bed253 100644
--- a/bashrc
+++ b/bashrc
@@ -264,7 +264,12 @@ export CLICOLOR=1
 export LSCOLORS=gxBxhxDxfxhxhxhxhxcxcx
 
 # make
-export NPROC=`nproc`
+if [[ $UNAME != Darwin ]]; then
+    export NPROC=`nproc`
+else
+    export NPROC=`sysctl -n hw.cpu`
+fi
+
 export MAKEFLAGS="-j$NPROC"
 export MAKE="make $MAKEFLAGS"
 alias make="make $MAKEFLAGS"
diff --git a/zshrc b/zshrc
index 3e405c99..46e781a7 100644
--- a/zshrc
+++ b/zshrc
@@ -202,7 +202,12 @@ export CLICOLOR=1
 export LSCOLORS=gxBxhxDxfxhxhxhxhxcxcx
 
 # make
-export NPROC=`nproc`
+if [[ $UNAME != Darwin ]]; then
+    export NPROC=`nproc`
+else
+    export NPROC=`sysctl -n hw.cpu`
+fi
+
 export MAKEFLAGS="-j$NPROC"
 export MAKE="make $MAKEFLAGS"
 alias make="make $MAKEFLAGS"