diff --git a/configure.ac b/configure.ac
index 2bf5bbe7..68d1e05f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3616,7 +3616,7 @@ AS_VAR_IF([[enable_asserts]], [["yes"]],
 )
 
 AS_UNSET([enabled_sanitizers])
-AM_TESTS_ENVIRONMENT=""
+TESTS_ENVIRONMENT_ac=""
 AM_ASAN_OPTIONS=""
 AM_UBSAN_OPTIONS=""
 AM_LSAN_OPTIONS=""
@@ -4105,7 +4105,7 @@ int main(void)
            AS_VAR_IF([enable_san_leak], ["yes"],
              [AM_LSAN_OPTIONS="use_unaligned=1"]
            )
-           AM_TESTS_ENVIRONMENT='\
+           TESTS_ENVIRONMENT_ac='\
     ASAN_OPTIONS="$(AM_ASAN_OPTIONS)" ; export ASAN_OPTIONS ; \
     UBSAN_OPTIONS="$(AM_UBSAN_OPTIONS)" ; export UBSAN_OPTIONS ; \
     LSAN_OPTIONS="$(AM_LSAN_OPTIONS)" ; export LSAN_OPTIONS ;'
@@ -4132,7 +4132,7 @@ AM_CONDITIONAL([USE_SANITIZERS],
 AC_SUBST([AM_ASAN_OPTIONS])
 AC_SUBST([AM_UBSAN_OPTIONS])
 AC_SUBST([AM_LSAN_OPTIONS])
-AC_SUBST([AM_TESTS_ENVIRONMENT])
+AC_SUBST([TESTS_ENVIRONMENT_ac])
 
 MHD_LIB_LDFLAGS="$MHD_LIB_LDFLAGS"
 
diff --git a/doc/examples/Makefile.am b/doc/examples/Makefile.am
index cdb787d9..c7a24354 100644
--- a/doc/examples/Makefile.am
+++ b/doc/examples/Makefile.am
@@ -9,6 +9,8 @@ AM_CFLAGS = $(CFLAGS_ac) @LIBGCRYPT_CFLAGS@
 
 AM_LDFLAGS = $(LDFLAGS_ac)
 
+AM_TESTS_ENVIRONMENT = $(TESTS_ENVIRONMENT_ac)
+
 if USE_COVERAGE
   AM_CFLAGS += --coverage
 endif
diff --git a/src/examples/Makefile.am b/src/examples/Makefile.am
index c222b5db..7946745a 100644
--- a/src/examples/Makefile.am
+++ b/src/examples/Makefile.am
@@ -12,6 +12,8 @@ AM_LDFLAGS = $(LDFLAGS_ac)
 
 MHD_CPU_COUNT_DEF = -DMHD_CPU_COUNT=$(CPU_COUNT)
 
+AM_TESTS_ENVIRONMENT = $(TESTS_ENVIRONMENT_ac)
+
 if USE_COVERAGE
   AM_CFLAGS += --coverage
 endif
diff --git a/src/microhttpd/Makefile.am b/src/microhttpd/Makefile.am
index c25abab7..8e6e623a 100644
--- a/src/microhttpd/Makefile.am
+++ b/src/microhttpd/Makefile.am
@@ -8,6 +8,8 @@ AM_CFLAGS = $(CFLAGS_ac) $(HIDDEN_VISIBILITY_CFLAGS)
 
 AM_LDFLAGS = $(LDFLAGS_ac)
 
+AM_TESTS_ENVIRONMENT = $(TESTS_ENVIRONMENT_ac)
+
 lib_LTLIBRARIES = \
   libmicrohttpd.la
 
diff --git a/src/testcurl/Makefile.am b/src/testcurl/Makefile.am
index 11a489c3..1d198976 100644
--- a/src/testcurl/Makefile.am
+++ b/src/testcurl/Makefile.am
@@ -15,6 +15,8 @@ AM_CFLAGS = $(CFLAGS_ac) @LIBGCRYPT_CFLAGS@
 
 AM_LDFLAGS = $(LDFLAGS_ac)
 
+AM_TESTS_ENVIRONMENT = $(TESTS_ENVIRONMENT_ac)
+
 if USE_COVERAGE
   AM_CFLAGS += -fprofile-arcs -ftest-coverage
 endif
diff --git a/src/testcurl/https/Makefile.am b/src/testcurl/https/Makefile.am
index 324076ef..324a5314 100644
--- a/src/testcurl/https/Makefile.am
+++ b/src/testcurl/https/Makefile.am
@@ -16,6 +16,8 @@ AM_CFLAGS = $(CFLAGS_ac) @LIBGCRYPT_CFLAGS@
 
 AM_LDFLAGS = $(LDFLAGS_ac)
 
+AM_TESTS_ENVIRONMENT = $(TESTS_ENVIRONMENT_ac)
+
 if USE_COVERAGE
   AM_CFLAGS += --coverage
 endif
diff --git a/src/testzzuf/Makefile.am b/src/testzzuf/Makefile.am
index 12154dc2..d82d04e4 100644
--- a/src/testzzuf/Makefile.am
+++ b/src/testzzuf/Makefile.am
@@ -10,6 +10,8 @@ AM_CFLAGS = $(CFLAGS_ac) @LIBGCRYPT_CFLAGS@
 
 AM_LDFLAGS = $(LDFLAGS_ac)
 
+AM_TESTS_ENVIRONMENT = $(TESTS_ENVIRONMENT_ac)
+
 if USE_COVERAGE
   AM_CFLAGS += -fprofile-arcs -ftest-coverage
 endif