diff --git a/foma-avoid-deprecated-inet-functions.patch b/foma-avoid-deprecated-inet-functions.patch
new file mode 100644
index 0000000..32e940f
--- /dev/null
+++ b/foma-avoid-deprecated-inet-functions.patch
@@ -0,0 +1,40 @@
+diff -Nru foma-b44022c7d9d347dc7392aabbf72c82e558767675.orig/foma/flookup.c foma-b44022c7d9d347dc7392aabbf72c82e558767675/foma/flookup.c
+--- foma-b44022c7d9d347dc7392aabbf72c82e558767675.orig/foma/flookup.c	2020-09-28 21:00:09.000000000 +0200
++++ foma-b44022c7d9d347dc7392aabbf72c82e558767675/foma/flookup.c	2021-06-10 13:57:39.337587755 +0200
+@@ -355,6 +355,8 @@
+ 
+ void server_init(void) {
+     unsigned int rcvsize = 262144;
++    int retval;
++    char server_address_string[INET_ADDRSTRLEN];
+ 
+     if ((listen_sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
+ 	perror("socket() failed");
+@@ -373,7 +375,15 @@
+     serveraddr.sin_family = AF_INET;
+     serveraddr.sin_port = htons(port_number);
+     if (server_address != NULL) {
+-	serveraddr.sin_addr.s_addr = inet_addr(server_address);
++	retval = inet_pton(AF_INET, server_address, &serveraddr.sin_addr.s_addr);
++        if (retval != 1) {
++            if (retval == 0) {
++                printf("inet_pton() failed: string is not a valid address.\n");
++                exit(1);
++            }
++            perror("inet_pton() failed");
++            exit(1);
++        }
+     } else {
+ 	serveraddr.sin_addr.s_addr = INADDR_ANY;
+     }
+@@ -381,5 +391,9 @@
+ 	perror("bind() failed");
+ 	exit(1);
+     }
+-    printf("Started flookup server on %s port %i\n", inet_ntoa(serveraddr.sin_addr), port_number); fflush(stdout);
++    if (inet_ntop(AF_INET, &serveraddr.sin_addr, server_address_string, INET_ADDRSTRLEN) == NULL) {
++        perror("inet_ntop() failed");
++        exit(1);
++    }
++    printf("Started flookup server on %s port %i\n", server_address_string, port_number); fflush(stdout);
+ }
diff --git a/foma.spec b/foma.spec
index 95a1cfe..73853ec 100644
--- a/foma.spec
+++ b/foma.spec
@@ -9,7 +9,7 @@
 
 Name:           foma
 Version:        0.9.18
-Release:        0.11.%{snapshotdate}git%{shortcommit0}%{?dist}
+Release:        0.12.%{snapshotdate}git%{shortcommit0}%{?dist}
 Summary:        Xerox-compatible finite-state compiler
 
 License:        ASL 2.0
@@ -26,6 +26,7 @@ Source0:        https://github.com/mhulden/%{name}/archive/%{commit0}.tar.gz#/%{
 # the linker when building the shared library. For discussion on a similar
 # issue, see https://lists.debian.org/debian-devel/2016/05/msg00302.html
 Patch0:         foma-harden-build-fedora.patch
+Patch1:         foma-avoid-deprecated-inet-functions.patch
 
 BuildRequires:  gcc zlib-devel readline-devel flex bison
 BuildRequires: make
@@ -104,6 +105,9 @@ find %{buildroot} -name '*.a' -exec rm -f {} ';'
 
 
 %changelog
+* Thu Jun 10 2021 Mike FABIAN <mfabian@redhat.com> - 0.9.18-0.12.20200928gitb44022c
+- Add patch to avoid using deprecated inet_* functions. Related: rhbz#1966963
+
 * Thu Apr 15 2021 Mohan Boddu <mboddu@redhat.com> - 0.9.18-0.11.20200928gitb44022c
 - Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937