diff --git a/0001-ao_pulse.c-fix-latency-calculation.patch b/0001-ao_pulse.c-fix-latency-calculation.patch
new file mode 100644
index 0000000..f6a61fc
--- /dev/null
+++ b/0001-ao_pulse.c-fix-latency-calculation.patch
@@ -0,0 +1,26 @@
+From de5547ebc2b0ed37d69889c3c3aec6553d2d84cb Mon Sep 17 00:00:00 2001
+From: Stas Sergeev <stsp@users.sourceforge.net>
+Date: Wed, 18 Feb 2015 00:36:28 +0300
+Subject: [PATCH] ao_pulse.c: fix latency calculation
+
+This fixes periodic underruns with pa plugin.
+---
+ src/plugins/pulse/ao_pulse.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/plugins/pulse/ao_pulse.c b/src/plugins/pulse/ao_pulse.c
+index ff5497f..9c0f64a 100644
+--- a/src/plugins/pulse/ao_pulse.c
++++ b/src/plugins/pulse/ao_pulse.c
+@@ -259,7 +259,7 @@ int ao_plugin_open(ao_device *device, ao_sample_format *format) {
+     battr.prebuf = battr.minreq = battr.fragsize = -1;
+ 
+     battr.tlength = (int)(internal->buffer_time * format->rate) / 1000000 *
+-      ((format->bits+7)/8) + device->output_channels;
++      ((format->bits+7)/8) * device->output_channels;
+     battr.minreq = battr.tlength/4;
+     battr.maxlength = battr.tlength+battr.minreq;
+ 
+-- 
+2.1.0
+
diff --git a/libao.spec b/libao.spec
index 0599014..d369b2f 100644
--- a/libao.spec
+++ b/libao.spec
@@ -1,11 +1,12 @@
 Name:           libao
 Version:        1.2.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Cross Platform Audio Output Library
 Group:          System Environment/Libraries
 License:        GPLv2+
 URL:            http://xiph.org/ao/
 Source0:        http://downloads.xiph.org/releases/ao/%{name}-%{version}.tar.gz
+Patch1:         0001-ao_pulse.c-fix-latency-calculation.patch
 BuildRequires:  alsa-lib-devel
 BuildRequires:  pkgconfig(libpulse)
 
@@ -26,6 +27,7 @@ developing applications that use %{name}.
 
 %prep
 %setup -q
+%patch1 -p1
 sed -i "s/-O20 -ffast-math//" configure
 
 
@@ -64,6 +66,9 @@ rm -rf $RPM_BUILD_ROOT%{_docdir}/%{name}*
 
 
 %changelog
+* Fri Feb 20 2015 Hans de Goede <hdegoede@redhat.com> - 1.2.0-4
+- Add a patch fixing pulseaudio buffersize calculations (rhbz#1193688)
+
 * Sun Aug 17 2014 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.2.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_21_22_Mass_Rebuild