diff --git a/qconfig-multilib.h b/qconfig-multilib.h
index 7ed351b..a104c37 100644
--- a/qconfig-multilib.h
+++ b/qconfig-multilib.h
@@ -6,7 +6,10 @@
 
 #ifndef QCONFIG_MULTILIB_H
 #define QCONFIG_MULTILIB_H
+
+#ifndef __WORDSIZE
 #include <bits/wordsize.h>
+#endif
 
 #if __WORDSIZE == 32
 #include "QtCore/qconfig-32.h"
diff --git a/qt5-qtbase.spec b/qt5-qtbase.spec
index 8071d4c..d43e7ff 100644
--- a/qt5-qtbase.spec
+++ b/qt5-qtbase.spec
@@ -39,7 +39,7 @@
 Summary: Qt5 - QtBase components
 Name:    qt5-qtbase
 Version: 5.6.0
-Release: 0.12%{?dist}
+Release: 0.13%{?dist}
 
 # See LGPL_EXCEPTIONS.txt, for exception details
 License: LGPLv2 with exceptions or GPLv3 with exceptions
@@ -73,6 +73,11 @@ Patch50: qt5-poll.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=1083664
 Patch51: qtbase-opensource-src-5.5-disconnect_displays.patch
 
+# Workaround moc/multilib issues
+# https://bugzilla.redhat.com/show_bug.cgi?id=1290020
+# https://bugreports.qt.io/browse/QTBUG-49972
+Patch52: qtbase-opensource-src-5.6.0-moc_WORDSIZE.patch
+
 ## upstream patches
 # workaround https://bugreports.qt-project.org/browse/QTBUG-43057
 # 'make docs' crash on el6, use qSort instead of std::sort
@@ -316,6 +321,7 @@ rm -fv mkspecs/linux-g++*/qmake.conf.multilib-optflags
 %patch12 -p1 -b .enable_ft_lcdfilter
 
 #patch51 -p1 -b .disconnect_displays
+%patch52 -p1 -b .moc_WORDSIZE
 
 %if 0%{?rhel} == 6
 %patch100 -p1 -b .QTBUG-43057
@@ -859,6 +865,9 @@ fi
 
 
 %changelog
+* Wed Dec 16 2015 Rex Dieter <rdieter@fedoraproject.org> 5.6.0-0.13
+- workaround moc/qconfig-multilib issues (#1290020,QTBUG-49972)
+
 * Wed Dec 16 2015 Peter Robinson <pbrobinson@fedoraproject.org> 5.6.0-0.12
 - aarch64 is secondary arch too
 - ppc64le is NOT multilib
diff --git a/qtbase-opensource-src-5.6.0-moc_WORDSIZE.patch b/qtbase-opensource-src-5.6.0-moc_WORDSIZE.patch
new file mode 100644
index 0000000..62d1e9c
--- /dev/null
+++ b/qtbase-opensource-src-5.6.0-moc_WORDSIZE.patch
@@ -0,0 +1,14 @@
+diff -up qtbase-opensource-src-5.6.0-beta/src/tools/moc/main.cpp.moc_WORDSIZE qtbase-opensource-src-5.6.0-beta/src/tools/moc/main.cpp
+--- qtbase-opensource-src-5.6.0-beta/src/tools/moc/main.cpp.moc_WORDSIZE	2015-12-04 18:05:24.000000000 -0600
++++ qtbase-opensource-src-5.6.0-beta/src/tools/moc/main.cpp	2015-12-15 20:57:55.554485416 -0600
+@@ -184,6 +184,10 @@ int runMoc(int argc, char **argv)
+     Moc moc;
+     pp.macros["Q_MOC_RUN"];
+     pp.macros["__cplusplus"];
++    Macro macro;
++    macro.symbols = Preprocessor::tokenize(QByteArray::number(Q_PROCESSOR_WORDSIZE*8), 1, Preprocessor::TokenizeDefine);
++    macro.symbols.removeLast(); // remove the EOF symbol
++    pp.macros.insert("__WORDSIZE", macro);
+ 
+     // Don't stumble over GCC extensions
+     Macro dummyVariadicFunctionMacro;