diff --git a/target-arm/helper.c b/target-arm/helper.c
index 9cf159c07c..538e17a35c 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -162,10 +162,11 @@ void do_interrupt(CPUARMState *env)
     }
     switch_mode (env, new_mode);
     env->spsr = cpsr_read(env);
-    /* Switch to the new mode, and clear the thumb bit.  */
+    /* Switch to the new mode, and switch to Arm mode.  */
     /* ??? Thumb interrupt handlers not implemented.  */
-    env->uncached_cpsr = (env->uncached_cpsr & ~(CPSR_M | CPSR_T)) | new_mode;
+    env->uncached_cpsr = (env->uncached_cpsr & ~CPSR_M) | new_mode;
     env->uncached_cpsr |= mask;
+    env->thumb = 0;
     env->regs[14] = env->regs[15] + offset;
     env->regs[15] = addr;
     env->interrupt_request |= CPU_INTERRUPT_EXITTB;