diff --git a/CHANGES b/CHANGES
index e89d05adef..acc0e6c29c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+5385.	[func]		Make ISC rwlock implementation the default again.
+			[GL #1753]
+
 5384.	[bug]		With dnssec-policy, inline-signing was implicitly set
 			to yes.  Change and only set inline-signing to yes
 			if the zone is not dynamic. [GL #1709]
diff --git a/configure b/configure
index 69ed062df3..9d84854757 100755
--- a/configure
+++ b/configure
@@ -1624,9 +1624,8 @@ Optional Features:
   --enable-devpoll        use /dev/poll when available [default=yes]
   --disable-geoip         support GeoIP2 geolocation ACLs if available
                           [default=yes]
-  --disable-pthread-rwlock
-                          use internal rwlock implementation instead of
-                          pthread rwlock
+  --enable-pthread-rwlock use pthread rwlock instead of internal rwlock
+                          implementation
   --enable-fips-mode      enable FIPS mode in OpenSSL library [default=no]
   --enable-native-pkcs11  use native PKCS11 for public-key crypto [default=no]
   --disable-tcp-fastopen  disable TCP Fast Open support [default=yes]
@@ -16001,7 +16000,7 @@ done
 if test "${enable_pthread_rwlock+set}" = set; then :
   enableval=$enable_pthread_rwlock;
 else
-  enable_pthread_rwlock=yes
+  enable_pthread_rwlock=no
 fi
 
 
diff --git a/configure.ac b/configure.ac
index d2a94e1c0a..3f36c92c22 100644
--- a/configure.ac
+++ b/configure.ac
@@ -685,9 +685,9 @@ AC_SUBST(ALWAYS_DEFINES)
 # Do we want to use pthread rwlock?
 #
 AC_ARG_ENABLE([pthread_rwlock],
-	      [AS_HELP_STRING([--disable-pthread-rwlock],
-			      [use internal rwlock implementation instead of pthread rwlock])],
-	      [], [enable_pthread_rwlock=yes])
+	      [AS_HELP_STRING([--enable-pthread-rwlock],
+			      [use pthread rwlock instead of internal rwlock implementation])],
+	      [], [enable_pthread_rwlock=no])
 
 AS_IF([test "$enable_pthread_rwlock" = "yes"],
       [AC_CHECK_FUNCS([pthread_rwlock_rdlock], [],
diff --git a/doc/arm/notes-9.17.2.xml b/doc/arm/notes-9.17.2.xml
index 5a8842f8f5..f3db134a68 100644
--- a/doc/arm/notes-9.17.2.xml
+++ b/doc/arm/notes-9.17.2.xml
@@ -45,7 +45,8 @@
     <itemizedlist>
       <listitem>
         <para>
-          None.
+          The default rwlock implementation has been changed back to the native
+          BIND 9 rwlock implementation. [GL #1753]
         </para>
       </listitem>
     </itemizedlist>