diff --git a/bin/build.sh b/bin/build.sh
index d7f57c9..3511281 100755
--- a/bin/build.sh
+++ b/bin/build.sh
@@ -1,7 +1,7 @@
 #!/bin/env sh
 
 if [ "$1" = "web" ]; then
-    emcmake cmake -B .build-web "${@:2}" && cmake --build .build-web
+    emcmake cmake -B .build-web "${@:2}" && cmake --build .build-web --parallel
 else
-    cmake -B .build "$@" && cmake --build .build
+    cmake -B .build "$@" && cmake --build .build --parallel
 fi