diff --git a/tests/dockerfiles/Dockerfile.alpine b/tests/dockerfiles/Dockerfile.alpine
index 5a9292e89..c32557b5d 100644
--- a/tests/dockerfiles/Dockerfile.alpine
+++ b/tests/dockerfiles/Dockerfile.alpine
@@ -106,9 +106,6 @@ RUN set -eux; \
 	rm -vf /usr/include/iconv.h; \
 	\
 	export \
-		CFLAGS="$PHP_CFLAGS" \
-		CPPFLAGS="$PHP_CPPFLAGS" \
-		LDFLAGS="$PHP_LDFLAGS" \
 # https://github.com/php/php-src/blob/d6299206dd828382753453befd1b915491b741c6/configure.ac#L1496-L1511
 		PHP_BUILD_PROVIDER='https://github.com/docker-library/php' \
 		PHP_UNAME='Linux - Docker' \