diff --git a/configure b/configure
index d4e27ede..3dd03017 100755
--- a/configure
+++ b/configure
@@ -226,7 +226,7 @@ EOF
               cd "\${QP_ROOT}"/external
               tar --gunzip --extract --file qp2-dependencies/zeromq-4.2.5.tar.gz
               cd zeromq-*
-              [[ ${SYSTEM} = Darwin ]] && ./autogen.sh
+              [[ "${SYSTEM}" = "Darwin" ]] && ./autogen.sh
               ./configure --prefix="\$QP_ROOT" --without-libsodium --enable-libunwind=no
               make -j 8
               make install