diff --git a/ruby/PKGBUILD b/ruby/PKGBUILD
index 7da6b4315bb..60af478761e 100644
--- a/ruby/PKGBUILD
+++ b/ruby/PKGBUILD
@@ -93,7 +93,7 @@ build() {
     --with-dbm-type=gdbm_compat \
     LDSHARED="gcc -shared" \
     DLDFLAGS="-Wl,--export-all-symbols"
-  make
+  make -j1
 }
 
 check() {