diff --git a/Dockerfile b/Dockerfile
index e3a6fe0..507bfd7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -52,7 +52,7 @@ RUN ./configure --prefix=/usr/share/nginx \
                 --without-mail_imap_module \
                 --without-mail_smtp_module \
                 --with-cc-opt="-Wl,--gc-sections -static -static-libgcc -O2 -ffunction-sections -fdata-sections -fPIC -fstack-protector-all -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security"
-ARG CORE_COUNT="1"
+ARG CORE_COUNT
 RUN make -j"$CORE_COUNT"
 RUN make install