--- valgrind-tests.m4	2018-05-25 10:11:51.767309109 +0200
+++ valgrind-tests.m4.gnutls	2018-05-25 10:20:02.999088040 +0200
@@ -12,9 +12,9 @@
 AC_DEFUN([gl_VALGRIND_TESTS],
 [
   AC_ARG_ENABLE([valgrind-tests],
-    AS_HELP_STRING([--disable-valgrind-tests],
-                   [don't try to run self tests under valgrind]),
-    [opt_valgrind_tests=$enableval], [opt_valgrind_tests=yes])
+    AS_HELP_STRING([--enable-valgrind-tests],
+                   [try to run self tests under valgrind]),
+    [opt_valgrind_tests=$enableval], [opt_valgrind_tests=no])
 
   # Run self-tests under valgrind?
   if test "$opt_valgrind_tests" = "yes" && test "$cross_compiling" = no; then