diff --git a/src/cpu/cpu.c b/src/cpu/cpu.c
index 891790823..3e6f9b0e8 100644
--- a/src/cpu/cpu.c
+++ b/src/cpu/cpu.c
@@ -734,6 +734,7 @@ cpu_set(void)
 		case CPU_iDX4:
 		cpu_features = CPU_FEATURE_CR4 | CPU_FEATURE_VME;
 		cpu_CR4_mask = CR4_VME | CR4_PVI | CR4_VME;
+		/*FALLTHROUGH*/
                 case CPU_i486SX:
                 case CPU_i486DX:
 #ifdef USE_DYNAREC
diff --git a/src/cpu_new/cpu.c b/src/cpu_new/cpu.c
index 26b790dc4..1d2c0fb19 100644
--- a/src/cpu_new/cpu.c
+++ b/src/cpu_new/cpu.c
@@ -739,6 +739,7 @@ cpu_set(void)
 		case CPU_iDX4:
 		cpu_features = CPU_FEATURE_CR4 | CPU_FEATURE_VME;
 		cpu_CR4_mask = CR4_VME | CR4_PVI | CR4_VME;
+		/*FALLTHROUGH*/
                 case CPU_i486SX:
                 case CPU_i486DX:
 #ifdef USE_DYNAREC
diff --git a/src/disk/hdc_ide.c b/src/disk/hdc_ide.c
index b86605761..c0250adc6 100644
--- a/src/disk/hdc_ide.c
+++ b/src/disk/hdc_ide.c
@@ -1459,6 +1459,7 @@ ide_writeb(uint16_t addr, uint8_t val, void *priv)
 				/* Turn on the activity indicator *here* so that it gets turned on
 				   less times. */
 				ui_sb_update_icon(SB_HDD | hdd[ide->hdd_num].bus, 1);
+				/*FALLTHROUGH*/
 
 			case WIN_READ:
 			case WIN_READ_NORETRY:
@@ -1492,6 +1493,7 @@ ide_writeb(uint16_t addr, uint8_t val, void *priv)
 				/* Turn on the activity indicator *here* so that it gets turned on
 				   less times. */
 				ui_sb_update_icon(SB_HDD | hdd[ide->hdd_num].bus, 1);
+				/*FALLTHROUGH*/
 
 			case WIN_WRITE:
 			case WIN_WRITE_NORETRY:
diff --git a/src/scsi/scsi_buslogic.c b/src/scsi/scsi_buslogic.c
index 15a4dc7d4..0f3141485 100644
--- a/src/scsi/scsi_buslogic.c
+++ b/src/scsi/scsi_buslogic.c
@@ -1250,6 +1250,7 @@ BuslogicPCIWrite(int func, int addr, uint8_t val, void *p)
 
 	case 0x14:
 		val &= 0xe0;
+		/*FALLTHROUGH*/
 
 	case 0x15: case 0x16: case 0x17:
 		/* MMIO Base set. */
diff --git a/src/scsi/scsi_cdrom.c b/src/scsi/scsi_cdrom.c
index cb3895a4c..cbe32f15a 100644
--- a/src/scsi/scsi_cdrom.c
+++ b/src/scsi/scsi_cdrom.c
@@ -1537,6 +1537,8 @@ scsi_cdrom_command(scsi_common_t *sc, uint8_t *cdb)
 		/* IMPORTANT: Convert the command to new read CD
 			      for pass through purposes. */
 		dev->current_cdb[0] = 0xbe;
+		/*FALLTHROUGH*/
+
 	case GPCMD_READ_6:
 	case GPCMD_READ_10:
 	case GPCMD_READ_12:
diff --git a/src/scsi/scsi_disk.c b/src/scsi/scsi_disk.c
index 6203a7ac4..741fc04d4 100644
--- a/src/scsi/scsi_disk.c
+++ b/src/scsi/scsi_disk.c
@@ -613,6 +613,7 @@ scsi_disk_command(scsi_common_t *sc, uint8_t *cdb)
 			scsi_disk_invalid_field(dev);
 			return;
 		}
+		/*FALLTHROUGH*/
 	case GPCMD_SCSI_RESERVE:
 	case GPCMD_SCSI_RELEASE:
 	case GPCMD_TEST_UNIT_READY:
diff --git a/src/sound/snd_gus.c b/src/sound/snd_gus.c
index 1f8fcfd3b..3df40d2a0 100644
--- a/src/sound/snd_gus.c
+++ b/src/sound/snd_gus.c
@@ -619,6 +619,7 @@ gus->curx[gus->voice]=(gus->curx[gus->voice]&0xFFF8000)|((val&0x7F)<<8);
                         else if (gus->irq != 0)
                                 picint(1 << gus->irq);
                 }
+		/*FALLTHROUGH*/
                 case 0x20d:
                 gus->sb_2xc = val;
                 break;
@@ -820,6 +821,7 @@ uint8_t readgus(uint16_t addr, void *p)
                 case 0x209: 
                 gus->ad_status &= ~0x01;
                 nmi = 0;
+		/*FALLTHROUGH*/
                 case 0x389:
                 val = gus->ad_data;
                 break;
diff --git a/src/video/vid_ati_mach64.c b/src/video/vid_ati_mach64.c
index 03f7309f3..9f29c162b 100644
--- a/src/video/vid_ati_mach64.c
+++ b/src/video/vid_ati_mach64.c
@@ -1993,6 +1993,7 @@ uint8_t mach64_ext_readb(uint32_t addr, void *p)
                 break;
                 case 0x2a4: case 0x2a5:
                 addr += 2;
+		/*FALLTHROUGH*/
                 case 0x2aa: case 0x2ab:                       
                 mach64_wait_fifo_idle(mach64);
                 READ8(addr, mach64->sc_left_right);