diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1a58a443..4a1ceede 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -111,3 +111,17 @@ jobs:
       run: brew install autoconf automake libtool libevent pkg-config openssl@1.1
     - name: Build
       run: autoreconf -ivf && PKG_CONFIG_PATH=/usr/local/opt/openssl@1.1/lib/pkgconfig ./configure && make
+
+  build-macos-openssl-1.0:
+    strategy:
+      matrix:
+        platform: [macos-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install dependencies
+      run: brew install autoconf automake libtool libevent pkg-config
+    - name: Install openssl v1.0.2
+      run: brew install rbenv/tap/openssl@1.0
+    - name: Build
+      run: autoreconf -ivf && PKG_CONFIG_PATH=/usr/local/opt/openssl@1.0/lib/pkgconfig ./configure && make
diff --git a/memtier_benchmark.cpp b/memtier_benchmark.cpp
index 61f560a2..2314da88 100755
--- a/memtier_benchmark.cpp
+++ b/memtier_benchmark.cpp
@@ -1392,8 +1392,11 @@ int main(int argc, char *argv[])
             SSL_CTX_set_options(cfg.openssl_ctx, SSL_OP_NO_TLSv1_1);
         if (!(cfg.tls_protocols & REDIS_TLS_PROTO_TLSv1_2))
             SSL_CTX_set_options(cfg.openssl_ctx, SSL_OP_NO_TLSv1_2);
+// TLS 1.3 is only available as from version 1.1.1.
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L
         if (!(cfg.tls_protocols & REDIS_TLS_PROTO_TLSv1_3))
             SSL_CTX_set_options(cfg.openssl_ctx, SSL_OP_NO_TLSv1_3);
+#endif
 
         if (cfg.tls_cert) {
             if (!SSL_CTX_use_certificate_chain_file(cfg.openssl_ctx, cfg.tls_cert)) {