diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index d7411bcc8139350494ca0c1917976e6912755d93..ad0612555db4e6a106228f74728b0ca94a0413c4 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -527,6 +527,7 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
         break;
     case POWERPC_EXCP_HISI:      /* Hypervisor instruction storage exception */
         msr |= env->error_code;
+        /* fall through */
     case POWERPC_EXCP_HDECR:     /* Hypervisor decrementer exception         */
     case POWERPC_EXCP_HDSI:      /* Hypervisor data storage exception        */
     case POWERPC_EXCP_HDSEG:     /* Hypervisor data segment exception        */