diff --git a/travis-build.sh b/travis-build.sh
index e773b823..461306c7 100755
--- a/travis-build.sh
+++ b/travis-build.sh
@@ -18,6 +18,7 @@ if [ -n "${PHP_VERSION}" ]; then
     if [ "${PHP_VERSION}" == "5.6" ]; then
         # Aerospike C Client SDK 4.0.7, Debian 9.6 is not supported
         # https://github.com/aerospike/aerospike-client-php5/issues/145
+        sed -i -- 's/WORKSPACE_INSTALL_AEROSPIKE=true/WORKSPACE_INSTALL_AEROSPIKE=false/g' .env
         sed -i -- 's/PHP_FPM_INSTALL_AEROSPIKE=true/PHP_FPM_INSTALL_AEROSPIKE=false/g' .env
     fi
     if [ "${PHP_VERSION}" == "7.3" ]; then