diff --git a/babeltrace-__openat_missing_mode.patch b/babeltrace-__openat_missing_mode.patch
new file mode 100644
index 0000000..9542d55
--- /dev/null
+++ b/babeltrace-__openat_missing_mode.patch
@@ -0,0 +1,21 @@
+--- babeltrace-1.5.8/formats/ctf/ctf.c.orig	2020-10-23 11:45:34.351789250 -0700
++++ babeltrace-1.5.8/formats/ctf/ctf.c	2020-10-23 12:16:24.236460342 -0700
+@@ -2191,7 +2191,7 @@
+ 	struct stat statbuf;
+ 	char *index_name;
+ 
+-	fd = openat(td->dirfd, path, flags);
++	fd = openat(td->dirfd, path, flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ 	if (fd < 0) {
+ 		perror("File stream openat()");
+ 		ret = fd;
+@@ -2265,7 +2265,8 @@
+ 			goto error_index;
+ 		}
+ 	} else {
+-		ret = openat(td->dirfd, index_name, flags);
++		ret = openat(td->dirfd, index_name, flags,
++				S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ 		if (ret < 0) {
+ 			perror("Index file openat()");
+ 			ret = -1;
diff --git a/babeltrace.spec b/babeltrace.spec
index 30c27fd..b4ac740 100644
--- a/babeltrace.spec
+++ b/babeltrace.spec
@@ -1,6 +1,6 @@
 Name:           babeltrace
 Version:        1.5.8
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Trace Viewer and Converter, mainly for the Common Trace Format
 License:        MIT and GPLv2
 URL:            https://www.efficios.com/babeltrace
@@ -9,6 +9,7 @@ Source1:        https://www.efficios.com/files/%{name}/%{name}-%{version}.tar.bz
 # gpg2 --export --export-options export-minimal 7F49314A26E0DE78427680E05F1B2A0789F12B11 > gpgkey-7F49314A26E0DE78427680E05F1B2A0789F12B11.gpg
 Source2:        gpgkey-7F49314A26E0DE78427680E05F1B2A0789F12B11.gpg
 Patch0:         python39.patch
+Patch1:         babeltrace-__openat_missing_mode.patch
 
 BuildRequires:  bison >= 2.4
 BuildRequires:  flex >= 2.5.35
@@ -115,6 +116,10 @@ rm -f %{buildroot}/%{_pkgdocdir}/std-ext-lib.txt
 
 
 %changelog
+* Mon Oct 26 2020 Keith Seitz <keiths@redhat.com> - 1.5.8-4
+- Workaround __openat_missing_mode compiler error.
+  (Keith Seitz, RH BZ 1890813)
+
 * Mon Jul 27 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.5.8-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild