diff --git a/configure b/configure
index 1bd7db88b3..979e32e050 100755
--- a/configure
+++ b/configure
@@ -3152,6 +3152,7 @@ if [ "$XPLATFORM_IOS" = "yes" ]; then
     CFG_NOBUILD_PARTS="$CFG_NOBUILD_PARTS examples"
     CFG_SHARED="no" # iOS builds should be static to be able to submit to the App Store
     CFG_SKIP_MODULES="$CFG_SKIP_MODULES qtconnectivity qtdoc qtmacextras qtserialport qtwebkit qtwebkit-examples"
+    CFG_PRECOMPILE="no" # Precompiled headers not supported with multiple -arch arguments
 
     # If the user passes -sdk on the command line we build a SDK-specific Qt build.
     # Otherwise we build a joined simulator and device build, which is the default.
diff --git a/mkspecs/macx-ios-clang/features/default_post.prf b/mkspecs/macx-ios-clang/features/default_post.prf
index 34fbac56d0..0245c948d9 100644
--- a/mkspecs/macx-ios-clang/features/default_post.prf
+++ b/mkspecs/macx-ios-clang/features/default_post.prf
@@ -209,6 +209,8 @@ macx-xcode {
     else: \
         VALID_ARCHS = $$QMAKE_IOS_SIMULATOR_ARCHS
 
+    single_arch: VALID_ARCHS = $$first(VALID_ARCHS)
+
     ACTIVE_ARCHS = $(filter $(EXPORT_VALID_ARCHS), $(ARCHS))
     ARCH_ARGS = $(foreach arch, $(if $(EXPORT_ACTIVE_ARCHS), $(EXPORT_ACTIVE_ARCHS), $(EXPORT_VALID_ARCHS)), -arch $(arch))
 
diff --git a/mkspecs/macx-ios-clang/features/qt_config.prf b/mkspecs/macx-ios-clang/features/qt_config.prf
index d9a13f65eb..d1a1a36933 100644
--- a/mkspecs/macx-ios-clang/features/qt_config.prf
+++ b/mkspecs/macx-ios-clang/features/qt_config.prf
@@ -9,4 +9,8 @@ isEmpty(QT_ARCH) {
         QT_ARCH = arm
     else: \ # Simulator
         QT_ARCH = i386
+
+    # Prevent the arch/config tests from building as multi-arch binaries,
+    # as we only want the lowest common denominator features.
+    CONFIG += single_arch
 }
diff --git a/mkspecs/macx-ios-clang/qmake.conf b/mkspecs/macx-ios-clang/qmake.conf
index 7b2e7a17e7..0c083edf80 100644
--- a/mkspecs/macx-ios-clang/qmake.conf
+++ b/mkspecs/macx-ios-clang/qmake.conf
@@ -15,8 +15,8 @@ DEFINES                += DARWIN_NO_CARBON QT_NO_PRINTER QT_NO_PRINTDIALOG
 # Universal target (iPhone and iPad)
 QMAKE_IOS_TARGETED_DEVICE_FAMILY = 1,2
 
-QMAKE_IOS_DEVICE_ARCHS = armv7
-QMAKE_IOS_SIMULATOR_ARCHS = i386
+QMAKE_IOS_DEVICE_ARCHS = armv7 arm64
+QMAKE_IOS_SIMULATOR_ARCHS = i386 x86_64
 
 include(../common/ios.conf)
 include(../common/gcc-base-mac.conf)