diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 31cb55b..e7075b8 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -663,6 +663,45 @@
     if_build_succeeded tests/compat.sh
 }
 
+component_test_zlib_make() {
+    msg "build: zlib enabled, make"
+    scripts/config.pl set MBEDTLS_ZLIB_SUPPORT
+    make ZLIB=1 CFLAGS='-Werror -O1'
+
+    msg "test: main suites (zlib, make)"
+    make test
+
+    msg "test: ssl-opt.sh (zlib, make)"
+    if_build_succeeded tests/ssl-opt.sh
+}
+support_test_zlib_make () {
+    base=support_test_zlib_$$
+    cat <<'EOF' > ${base}.c
+#include "zlib.h"
+int main(void) { return 0; }
+EOF
+    gcc -o ${base}.exe ${base}.c -lz 2>/dev/null
+    ret=$?
+    rm -f ${base}.*
+    return $ret
+}
+
+component_test_zlib_cmake() {
+    msg "build: zlib enabled, cmake"
+    scripts/config.pl set MBEDTLS_ZLIB_SUPPORT
+    cmake -D ENABLE_ZLIB_SUPPORT=On -D CMAKE_BUILD_TYPE:String=Check .
+    make
+
+    msg "test: main suites (zlib, cmake)"
+    make test
+
+    msg "test: ssl-opt.sh (zlib, cmake)"
+    if_build_succeeded tests/ssl-opt.sh
+}
+support_test_zlib_cmake () {
+    support_test_zlib_make "$@"
+}
+
 component_test_ref_configs () {
     msg "test/build: ref-configs (ASan build)" # ~ 6 min 20s
     CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 331833d..9e24d5b 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -747,6 +747,18 @@
             -s "Protocol is DTLSv1.2" \
             -s "Ciphersuite is TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"
 
+requires_config_enabled MBEDTLS_ZLIB_SUPPORT
+run_test    "Default (compression enabled)" \
+            "$P_SRV debug_level=3" \
+            "$P_CLI debug_level=3" \
+            0 \
+            -s "Allocating compression buffer" \
+            -c "Allocating compression buffer" \
+            -s "Record expansion is unknown (compression)" \
+            -c "Record expansion is unknown (compression)" \
+            -S "error" \
+            -C "error"
+
 # Test current time in ServerHello
 requires_config_enabled MBEDTLS_HAVE_TIME
 run_test    "Default, ServerHello contains gmt_unix_time" \