diff --git a/perl-5.29.0-perl.h-Add-parens-around-macro-arguments.patch b/perl-5.29.0-perl.h-Add-parens-around-macro-arguments.patch
new file mode 100644
index 0000000..73c003f
--- /dev/null
+++ b/perl-5.29.0-perl.h-Add-parens-around-macro-arguments.patch
@@ -0,0 +1,33 @@
+From ff58ca57f8442a7e2e74ab4a79a9e542f9a180e7 Mon Sep 17 00:00:00 2001
+From: Karl Williamson <khw@cpan.org>
+Date: Mon, 11 Jun 2018 13:26:24 -0600
+Subject: [PATCH] perl.h: Add parens around macro arguments
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Arguments used within macros need to be parenthesized in case they are
+called with an expression.  This commit changes
+_CHECK_AND_OUTPUT_WIDE_LOCALE_UTF8_MSG() to do that.
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ perl.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/perl.h b/perl.h
+index 6f04c6facd..3e1f6cd571 100644
+--- a/perl.h
++++ b/perl.h
+@@ -5632,7 +5632,7 @@ typedef struct am_table_short AMTS;
+ #    define _CHECK_AND_OUTPUT_WIDE_LOCALE_UTF8_MSG(s, send)                 \
+ 	STMT_START { /* Check if to warn before doing the conversion work */\
+             if (! PL_in_utf8_CTYPE_locale && ckWARN(WARN_LOCALE)) {         \
+-                UV cp = utf8_to_uvchr_buf((U8 *) s, (U8 *) send, NULL);     \
++                UV cp = utf8_to_uvchr_buf((U8 *) (s), (U8 *) (send), NULL); \
+                 Perl_warner(aTHX_ packWARN(WARN_LOCALE),                    \
+                     "Wide character (U+%" UVXf ") in %s",                   \
+                     (cp == 0)                                               \
+-- 
+2.14.4
+
diff --git a/perl.spec b/perl.spec
index 0814b83..711137a 100644
--- a/perl.spec
+++ b/perl.spec
@@ -161,6 +161,9 @@ Patch16:        perl-5.29.0-Perl_my_setenv-handle-integer-wrap.patch
 # expression while ISO-8859-1 locale is in effect
 Patch17:        perl-5.29.0-regexec.c-Call-macro-with-correct-args.patch
 
+# Fix invoking a check for wide characters while ISO-8859-1 locale is in effect
+Patch18:        perl-5.29.0-perl.h-Add-parens-around-macro-arguments.patch
+
 # Link XS modules to libperl.so with EU::CBuilder on Linux, bug #960048
 Patch200:       perl-5.16.3-Link-XS-modules-to-libperl.so-with-EU-CBuilder-on-Li.patch
 
@@ -2732,6 +2735,7 @@ Perl extension for Version Objects
 %patch15 -p1
 %patch16 -p1
 %patch17 -p1
+%patch18 -p1
 %patch200 -p1
 %patch201 -p1
 
@@ -2756,6 +2760,7 @@ perl -x patchlevel.h \
     'Fedora Patch15: Adjust tests to gdbm-1.15 (RT#133295)' \
     'Fedora Patch16: Fix an integer wrap when allocating memory for an environment variable (RT#133204)' \
     'Fedora Patch17: Fix printing a warning about a wide character when matching a regular expression while ISO-8859-1 locale is in effect' \
+    'Fedora Patch18: Fix invoking a check for wide characters while ISO-8859-1 locale is in effect' \
     'Fedora Patch200: Link XS modules to libperl.so with EU::CBuilder on Linux' \
     'Fedora Patch201: Link XS modules to libperl.so with EU::MM on Linux' \
     %{nil}
@@ -5050,6 +5055,7 @@ popd
   (RT#133204)
 - Fix printing a warning about a wide character when matching a regular
   expression while ISO-8859-1 locale is in effect
+- Fix invoking a check for wide characters while ISO-8859-1 locale is in effect
 
 * Wed Jun 27 2018 Jitka Plesnikova <jplesnik@redhat.com> - 4:5.28.0-416
 - Stop providing old perl(MODULE_COMPAT_5.26.*)