diff --git a/configure b/configure
index 375ea61ca..5e53a5462 100755
--- a/configure
+++ b/configure
@@ -7300,7 +7300,8 @@ fi
 
 # If they didn't specify it, we try to find it
 if test $have_pcre != yes -a $requested_included_pcre != yes ; then
-  ac_fn_c_check_header_compile "$LINENO" "pcre2.h" "ac_cv_header_pcre2_h" "$ac_includes_default"
+  ac_fn_c_check_header_compile "$LINENO" "pcre2.h" "ac_cv_header_pcre2_h" "#define PCRE2_CODE_UNIT_WIDTH 8
+"
 if test "x$ac_cv_header_pcre2_h" = xyes
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for pcre2_compile_8 in -lpcre2-8" >&5
@@ -7344,7 +7345,8 @@ then :
 fi
 
 else $as_nop
-  ac_fn_c_check_header_compile "$LINENO" "pcre2/pcre2.h" "ac_cv_header_pcre2_pcre2_h" "$ac_includes_default"
+  ac_fn_c_check_header_compile "$LINENO" "pcre2/pcre2.h" "ac_cv_header_pcre2_pcre2_h" "#define PCRE2_CODE_UNIT_WIDTH 8
+"
 if test "x$ac_cv_header_pcre2_pcre2_h" = xyes
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for pcre2_compile_8 in -lpcre2-8" >&5
@@ -7385,14 +7387,13 @@ printf "%s\n" "$ac_cv_lib_pcre2_8_pcre2_compile_8" >&6; }
 if test "x$ac_cv_lib_pcre2_8_pcre2_compile_8" = xyes
 then :
   have_pcre=yes
-      printf "%s\n" "#define HAVE_PCRE2_PCRE2_H 1" >>confdefs.h
+
+printf "%s\n" "#define HAVE_PCRE2_PCRE2_H 1" >>confdefs.h
 
 fi
 
-
 fi
 
-
 fi
 
 fi
diff --git a/configure.ac b/configure.ac
index 862a056e7..848907786 100644
--- a/configure.ac
+++ b/configure.ac
@@ -529,12 +529,17 @@ AC_HELP_STRING([--with-libpcre=included], [Always use the version included with
 # If they didn't specify it, we try to find it
 if test $have_pcre != yes -a $requested_included_pcre != yes ; then
   AC_CHECK_HEADER(pcre2.h,
-    AC_CHECK_LIB(pcre2-8, pcre2_compile_8, [have_pcre=yes ]),
-    [AC_CHECK_HEADER(pcre2/pcre2.h,
-     [AC_CHECK_LIB(pcre2-8, pcre2_compile_8, [have_pcre=yes
-      AC_DEFINE(HAVE_PCRE2_PCRE2_H, 1)])]
-    )]
-  )
+    AC_CHECK_LIB(pcre2-8,
+      pcre2_compile_8,
+      [have_pcre=yes ]),
+    AC_CHECK_HEADER(pcre2/pcre2.h,
+      AC_CHECK_LIB(pcre2-8,
+        pcre2_compile_8,
+        [have_pcre=yes
+        AC_DEFINE(HAVE_PCRE2_PCRE2_H, 1, [Using system pcre2/pcre2.h])]),
+      [],
+      [#define PCRE2_CODE_UNIT_WIDTH 8]),
+    [#define PCRE2_CODE_UNIT_WIDTH 8])
 fi
 
 # If we still don't have it, we use our own