diff --git a/cyrus-sasl-2.1.26-obsolete-macro.patch b/cyrus-sasl-2.1.26-obsolete-macro.patch
new file mode 100644
index 0000000..a836d8f
--- /dev/null
+++ b/cyrus-sasl-2.1.26-obsolete-macro.patch
@@ -0,0 +1,13 @@
+diff --git a/configure.in b/configure.in
+index e70c99a..60f366c 100644
+--- a/configure.in
++++ b/configure.in
+@@ -1416,7 +1416,7 @@ inline static unsigned int sleep(unsigned int seconds) {
+ #endif /* CONFIG_H */
+ ])
+ 
+-AM_CONFIG_HEADER(config.h)
++AC_CONFIG_HEADERS(config.h)
+ 
+ AC_OUTPUT(Makefile
+ libsasl2.pc
diff --git a/cyrus-sasl.spec b/cyrus-sasl.spec
index 015a147..111307b 100644
--- a/cyrus-sasl.spec
+++ b/cyrus-sasl.spec
@@ -38,6 +38,8 @@ Patch42: cyrus-sasl-2.1.26-relro.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=816250
 Patch43: cyrus-sasl-2.1.26-null-crypt.patch
 Patch44: cyrus-sasl-2.1.26-release-server_creds.patch
+# AM_CONFIG_HEADER is obsolete, use AC_CONFIG_HEADERS instead
+Patch45: cyrus-sasl-2.1.26-obsolete-macro.patch
 
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: autoconf, automake, libtool, gdbm-devel, groff
@@ -173,6 +175,7 @@ chmod -x include/*.h
 %patch42 -p1 -b .relro
 %patch43 -p1 -b .null-crypt
 %patch44 -p1 -b .release-server_creds
+%patch45 -p1 -b .obsolete-macro
 
 %build
 # FIXME - we remove these files directly so that we can avoid using the -f