diff --git a/disas/Makefile.objs b/disas/Makefile.objs
index 8dae4daec0..abeba84661 100644
--- a/disas/Makefile.objs
+++ b/disas/Makefile.objs
@@ -4,7 +4,10 @@ common-obj-$(CONFIG_ARM_DIS) += arm.o
 common-obj-$(CONFIG_ARM_A64_DIS) += arm-a64.o
 common-obj-$(CONFIG_ARM_A64_DIS) += libvixl/
 libvixldir = $(SRC_PATH)/disas/libvixl
-arm-a64.o-cflags := -I$(libvixldir)
+# The -Wno-sign-compare is needed only for gcc 4.6, which complains about
+# some signed-unsigned equality comparisons in libvixl which later gcc
+# versions do not.
+arm-a64.o-cflags := -I$(libvixldir) -Wno-sign-compare
 common-obj-$(CONFIG_CRIS_DIS) += cris.o
 common-obj-$(CONFIG_HPPA_DIS) += hppa.o
 common-obj-$(CONFIG_I386_DIS) += i386.o
diff --git a/disas/libvixl/Makefile.objs b/disas/libvixl/Makefile.objs
index e373cf02d3..d1e801a1e9 100644
--- a/disas/libvixl/Makefile.objs
+++ b/disas/libvixl/Makefile.objs
@@ -4,6 +4,8 @@ libvixl_OBJS = vixl/utils.o \
                vixl/a64/decoder-a64.o \
                vixl/a64/disasm-a64.o
 
-$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CFLAGS := -I$(SRC_PATH)/disas/libvixl $(QEMU_CFLAGS)
+# The -Wno-sign-compare is needed only for gcc 4.6, which complains about
+# some signed-unsigned equality comparisons which later gcc versions do not.
+$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CFLAGS := -I$(SRC_PATH)/disas/libvixl -Wno-sign-compare $(QEMU_CFLAGS)
 
 common-obj-$(CONFIG_ARM_A64_DIS) += $(libvixl_OBJS)