diff --git a/configure.ac b/configure.ac
index 8fe7d78..ac601a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -666,7 +666,7 @@ AM_CONDITIONAL([SQUATTER],
 AC_ARG_ENABLE(sieve,
         [AS_HELP_STRING([--disable-sieve], [disable Sieve support])],,[enable_sieve="yes";])
 AC_ARG_ENABLE(pcre,
-        [AS_HELP_STRING([--disable-pcre], [disable PCRE library])],[cyrus_cv_pcre_utf8="$enableval"])
+        [AS_HELP_STRING([--disable-pcre2], [disable PCRE library])],[cyrus_cv_pcre_utf8="$enableval"])
 
 if test "$enable_sieve" != "no"; then
         AC_DEFINE(USE_SIEVE,[],[Build in Sieve support?])
@@ -692,25 +692,25 @@ fi
 
 AM_CONDITIONAL([SIEVE], [test "${enable_sieve}" != "no"])
 
-if test "$enable_pcre" != "no"; then
-        AC_CHECK_HEADER(pcreposix.h)
-        if test "$ac_cv_header_pcreposix_h" = "yes"; then
-            AC_MSG_CHECKING(for utf8 enabled pcre)
-            AC_CACHE_VAL(cyrus_cv_pcre_utf8, AC_TRY_CPP([#include <pcreposix.h>
-#ifndef REG_UTF8
+if test "$enable_pcre2" != "no"; then
+        AC_CHECK_HEADER(pcre2posix.h)
+        if test "$ac_cv_header_pcre2posix_h" = "yes"; then
+            AC_MSG_CHECKING(for utf8 enabled pcre2)
+            AC_CACHE_VAL(cyrus_cv_pcre_utf8, AC_TRY_CPP([#include <pcre2posix.h>
+#ifndef REG_UTF
 #include </nonexistent>
-#endif],cyrus_cv_pcre_utf8=yes,cyrus_cv_pcre_utf8=no))
-            AC_MSG_RESULT($cyrus_cv_pcre_utf8)
+#endif],cyrus_cv_pcre2_utf8=yes,cyrus_cv_pcre2_utf8=no))
+            AC_MSG_RESULT($cyrus_cv_pcre2_utf8)
         else
-            cyrus_cv_pcre_utf8="no"
+            cyrus_cv_pcre2_utf8="no"
         fi
 fi
 
 LIB_REGEX=
-if test "$cyrus_cv_pcre_utf8" = "yes"; then
-        LIB_REGEX="-lpcre -lpcreposix";
+if test "$cyrus_cv_pcre2_utf8" = "yes"; then
+        LIB_REGEX="-lpcre2-posix";
         AC_DEFINE(ENABLE_REGEX, [], [Do we have a regex library?])
-        AC_DEFINE(HAVE_PCREPOSIX_H, [], [Do we have usable pcre library?])
+        AC_DEFINE(HAVE_PCRE2POSIX_H, [], [Do we have usable pcre2 library?])
 else
         AC_CHECK_HEADERS(rxposix.h)
         if test "$ac_cv_header_rxposix_h" = "yes"; then
diff --git a/sieve/bc_eval.c b/sieve/bc_eval.c
index f14a5d7..71f4c1f 100644
--- a/sieve/bc_eval.c
+++ b/sieve/bc_eval.c
@@ -318,7 +318,7 @@ static int regcomp_flags(int comparator, int requires)
 
 #ifdef HAVE_PCREPOSIX_H
     /* support UTF8 comparisons */
-    cflags |= REG_UTF8;
+    cflags |= REG_UTF;
 #endif
 
     if (comparator == B_ASCIICASEMAP) {
diff --git a/sieve/comparator.h b/sieve/comparator.h
index b043bc2..4be64a5 100644
--- a/sieve/comparator.h
+++ b/sieve/comparator.h
@@ -48,8 +48,7 @@
 
 #ifdef ENABLE_REGEX
 # ifdef HAVE_PCREPOSIX_H
-#  include <pcre.h>
-#  include <pcreposix.h>
+#  include <pcre2posix.h>
 # else /* !HAVE_PCREPOSIX_H */
 #  ifdef HAVE_RXPOSIX_H
 #   include <rxposix.h>
diff --git a/sieve/sieve.y b/sieve/sieve.y
index b080c26..8ce1b4e 100644
--- a/sieve/sieve.y
+++ b/sieve/sieve.y
@@ -2217,7 +2217,7 @@ static int verify_regexlist(sieve_script_t *sscript,
 
 #ifdef HAVE_PCREPOSIX_H
     /* support UTF8 comparisons */
-    cflags |= REG_UTF8;
+    cflags |= REG_UTF;
 #endif
 
     if (collation == B_ASCIICASEMAP) {